Frederic-104

"As Spartans we anticipate our involvement in any military campaign. It's who we are. It's what we were born to do. We're here to win this war and we're eager to do just that."

- Frederic-104, shortly before the Battle of Earth

Lieutenant, Junior Grade Frederic-104, phonetic callsign "Sierra 104", born Frederic Ellsworth, is a Spartan-II supersoldier of the United Nations Space Command's Naval Special Warfare Command. A skilled close-quarters combatant and marksman, Fred is a natural leader and a brilliant strategist. Having been a regular member of Blue Team almost since the unit's inception, Fred typically held the call sign of "Blue-Three". Since 2552, Fred has served as the commander of Blue Team, though he often defers leadership to close friend Master Chief Petty Officer John-117.

Frederic-104 had participated in numerous engagements throughout both the Insurrection and the Human-Covenant War. In 2525, Fred participated in Operation: TALON, the first operation of the Spartan-IIs. As the Covenant War began, Fred participated in numerous battles throughout the war, including the Battle of Sigma Octanus IV. Notably, Fred served as the leader of Red Team during the Fall of Reach, which ultimately saw the highest single operation death count of Spartan-IIs. Fred later participated in the Battle of Earth and the Battle of Onyx, commanding several of his fellow Spartans.

Following the end of the Covenant War in 2553, Fred has continued to serve as the leader of Blue Team and has since participated in numerous operations under the authority of the Office of Naval Intelligence. One of the few remaining Spartan-IIs, Fred holds the highest rank among his active-duty peers. As of August 2558, Fred has participated in 197 individual military operations and engagements, 139 of which were full campaigns.

Early life and conscription
"Fred-104"

- John-117

Frederic Ellsworth was born on the human Inner Colony of Ballast on April 3, 2511. In around 2517, Fred was identified as an extremely talented child, and marked as a potentially exceptional soldier and a candidate for Doctor Catherine Halsey's SPARTAN-II program as a result. On September 23, 2517, Fred was abducted by the United Nations Space Command's Office of Naval Intelligence at the age of six to be conscripted into the SPARTAN-II program. He was then replaced with a flash clone and sent to Reach in the Epsilon Eridani system with the other Spartans. His flash clone would die shortly after Fred's own abduction. Fred was trained with the other Spartans at Reach by "dumb" AI Déjà and Chief Petty Officer Franklin Mendez, with the two serving as the Spartans' teacher and drill instructor, respectively. Fred also participated in numerous training exercises, including the Spartans' mission to the Military Wilderness Training Preserve in 2519. During one training exercise, Fred and the other Spartans traveled to Emerald Cove for an underwater mission, where they abandoned Mendez and lived on their own on an island for a few days.

During his training, Fred quickly proved himself to be one of the SPARTAN-II program's top candidates. Both Doctor Halsey and Chief Mendez identified him as one of four emerging leaders within the program's candidates, along with Kurt-051, Jerome-092, and John-117. By July 14, 2523, Fred and his fellow Spartan-IIs had begun facing the formidable and ruthless UNSC Marine Corps' Tango Company in simulated war games. On March 9, 2525, Fred and the rest of the Spartan-II candidates underwent their augmentation procedures at Medical Facility Endurance orbiting Reach. After successfully enduring the procedures, Fred later attended a military funeral aboard carrier in the Lambda Serpentis system for the Spartans who died during the augmentation process. Afterwards, the Spartans returned to Reach for their final training phase in the Highland Mountains.

Infiltration on Eridanus Secundus
"Samuel-034"

- Fred-104

On September 14, 2525, shortly after the Spartans had recovered from augmentations, Fred was selected by John-117 to join Blue Team—also composed of Samuel-034, Linda-058, and Kelly-087. The team was then chosen for the Spartan-IIs' first mission, Operation: TALON. The operation's objective was to capture Colonel Robert Watts, a UNSC Marine turncoat officer and the leader of the United Rebel Front. ONI had recently discovered that Watts was residing within Eridanus Secundus, a large asteroid settlement and insurrectionist military base in the Eridanus system's largest asteroid belt.

Equipped with black body suits and MA2B assault rifles, Fred and the rest of Blue Team were brought to the Eridanus II space docks by the. Once at the docks, the Spartans then infiltrated the URF-operated Laden en route for Eridanus Secundus. While aboard the freighter, the Spartans learned that a crate of luxury goods was headed for Watts' location. The crate was tagged with a NAV marker transmitter, allowing the Spartans to track the crate to Watts' position once they reached the asteroid. When Laden arrived at one of the docking bays of Eridanus Secundus, Blue Team fought their way through Eridanus Secundus and URF soldiers until they reached Watts' apartment, located using the NAV marker they had placed on the crate. After killing several of Watts' security guards, Fred and the rest of Blue Team secured Watts inside a crate and returned to one of Eridanus Secundus' docking bays. With Sam detonating several C-12 explosives on the asteroid's main hangar bay doors, the Spartans escaped the rebel facility in a stolen D77-TC Pelican dropship with Watts, as the doors blew open and the hangar bay decompressed. With the mission complete, Blue Team had effectively severed the head of the United Rebel Front, at least for the time being.

The Covenant War begins
"Sam fell first. And yet he showed us that the Covenant could be killed. Sam proved we could win this war. Every battle won is built on the foundation of that sacrifice. If we survive this, it's because Sam showed us the way."

- Fred-104 on Sam's sacrifice aboard Unrelenting

After the Covenant attack on Harvest and the beginning of the Human-Covenant War, Fred and the rest of the Spartan-IIs were brought to the Reach FLEETCOM Military Complex, where Rear Admiral Michael Stanforth and the AI Beowulf briefed them on the emerging Covenant threat. In response, the training of Fred and the rest of the Spartan-IIs was accelerated, and the Spartans were sent to Chi Ceti IV in the Chi Ceti system to receive their new MJOLNIR Powered Assault Armor from Damascus Materials Testing Facility to aid in combat against the Covenant. While en route to Chi Ceti IV aboard, the frigate was attacked by Covenant warship Unrelenting. Commonwealth was able to ward off Unrelenting and the Spartans were deployed to Chi Ceti IV with Halsey, where they each retrieved a set of armor. While the Spartans were returning to Commonwealth, Unrelenting returned and engaged the frigate. To provide aid to Commonwealth, John had Fred and the other Spartan-IIs use thruster packs to embark towards Unrelenting to destroy the warship with Anvil-II AS missiles, though only John, Kelly, and Sam made it aboard. Ultimately, Sam sacrificed himself to destroy Unrelenting by detonating the missiles, while John and Kelly escaped and returned to Commonwealth. However, Sam's death proved to Fred that the Covenant could be killed and the UNSC could win the war. Fred and John briefly were later sent to support a group of Marines fighting rebels, but the skirmish quickly changed as the Covenant's arrival forced the UNSC troops to side with the rebels to combat the Covenant.

On April 26, 2526, Fred and the rest of Blue Team were deployed to Circinius IV to combat the Covenant invasion, as well as to evacuate civilian populations and observe Covenant invasion patterns. During the battle, Blue Team received a distress signal from a cadet squad pinned down at Corbulo Academy of Military Science; these cadets were the only survivors on the entire planet. While Kelly led Blue Team north to the evacuation point, John traveled to the cadets' location to rescue them. Eventually, John and the three surviving cadets reached Blue Team's evacuation point and rendezvoused with Fred and Kelly, where their Pelican immediately dusted off to regroup with surviving UNSC forces in the planet's orbit as Circinius IV was glassed by the Covenant.

Prior to 2530, Fred also participated in Operation: ROCK HOUSE, in which he neutralized an insurrectionist facility and personnel on Eridanus II. By 2531, Fred and the rest of Blue Team had repeatedly disrupted the operations of the United Rebel Front, including at Station Jefferson in the Eridanus system, onboard the destroyer Origami, in Micronesia, on Reach, and at a high-explosives manufacturing facility at an unspecified location. On May 1, 2531, Blue Team—then consisting of Fred, Kelly, Linda, John, and the recently added Kurt—had infiltrated the URF-controlled military base of Camp New Hope on Victoria to retrieve contraband nuclear weapons. However, the insurrectionists successfully ambushed Fred, Kelly, Linda, and John using an antigravity plate which disabled the Spartans. Before the rebels could interrogate the Spartans, Kurt freed Blue Team using a M12 Warthog and Asteroidea anti-personnel mines, where they eventually escaped the facility with the nuclear warheads. However, the rescue resulted in the death of the high-ranking rebel leader General Howard Graves. Several months later, on November 7, 2531, Fred was deployed on an extra-vehicular mission with Kurt and Kelly to Construction Platform 966A in the Groombridge 34 system to investigate reported suspicious activity. However, Kurt's thruster pack malfunctioned, sending him spinning away into deep space to his presumed death. In actuality, ONI had arranged the "incident" and had retrieved Kurt to use him as a trainer for candidates for the upcoming SPARTAN-III program.

In 2544, following the Battle of Miridem, Fred participated in an ONI-led operation which required a team of Spartan-IIs, consisting of Solomon-069, Arthur-079, Kelly-087, John-117, and himself, to infiltrate Covenant-controlled space at Ascon via OF92 Booster Frames and rescue the captured Halsey from the Covenant's Third Fleet of Glorious Consequence. The Covenant fleet was temporarily unable to enable their slipspace drives due to a stellar magnetic field, providing the Spartans some time to retrieve the package before the Covenant fleet departed. During the course of the operation, Arthur and Solomon were killed by the Covenant. The surviving Spartans then infiltrated the Supreme Commander Luro 'Taralumee's flagship and fought their way through numerous Covenant forces. When Major Thel 'Lodamee and two Sangheili Minors attacked the Spartans, Fred held them off and engaged them in combat to allow John and Kelly to advance towards Halsey's position. After getting separated from Kelly, John managed to rescue Halsey and escape the ship in a Covenant escape pod, while Fred and Kelly covered them with hijacked Type-31 Seraphs. The operation was successful, with the Spartans escorting Halsey back to the stealth ship that deployed them.

At some point, Fred and the rest of Blue Team participated in an operation to destroy Covenant ship Perpetual Devotion by overloading the vessel's reactors.

Battle of Sigma Octanus IV
"We've come to take Sigma Octanus Four back from the Covenant, Corporal. To do that, we're going to kill every last one of them."

- John-117 to Corporal Harland, referring to Blue Team's mission on the planet

On July 17, 2552, the Spartan-IIs arrived at the human colony of Sigma Octanus IV in the Sigma Octanus system with Vice Admiral Stanforth's Battle Group Leviathan to aid UNSC forces in the ongoing battle at the planet. Deployed to the remains of Alpha Headquarters to assist the local Marine forces as part of Operation: OCEAN BREAKER, Fred was assigned to Blue Team—along with Kelly and James-005—as "Blue-Three" under the command of John; Fred was given control of the unit's explosives. After meeting with the surviving Marines at Alpha Headquarters, Blue Team departed for the city of Côte d'Azur to investigate unusual Covenant activity and to destroy the city with a HAVOK tactical nuclear weapon if no civilians remained. The Spartans traveled through a jungle to reach the city, eliminating several patrols of Unggoy soldiers along the way. When Blue Team finally arrived at Côte d'Azur, the Spartans began scouting Covenant movements throughout the city, while Red Team and Green Team escorted the city's surviving population to safety.

As the other Spartans left the city with the civilians, Blue Team infiltrated the Covenant-held Côte d'Azur Museum of Natural History to investigate unusual Covenant activity. Blue Team discovered that the Covenant were scanning what appeared to be a simple piece of igneous rock, and sending the information to a ship in orbit. Fred and his compatriots quietly eliminated nearby Kig-Yar patrols inside the museum until they encountered a pair of Mgalekgolo. The Spartans battled the Mgalekgolo, though James was heavily injured in the fight. Upon John's orders, Blue Team switched to shredder rounds and fired at the floor beneath the massive aliens. The Spartans managed to make the floor collapse under the Mgalekgolo, causing them to fall into the museum's basement. To finish off the Mgalekgolo pair, Fred, Kelly, John, and the wounded James pushed a large quartz monolith into the pit, trapping the Mgalekgolo but not killing them. Recovering the rock that the Covenant were scanning, Blue Team left the museum and escaped the city by traveling through Côte d'Azur's sewer systems.

Upon rendezvousing with the rest of the Spartans and surviving Marines, Fred and other nearby UNSC forces escaped the area aboard Pelicans and detonated the HAVOK at the city as they returned to Stanforth's  in the planet's orbit. As the battle ended, Battle Group Leviathan returned to Reach at the Epsilon Eridani system for repairs, with the Spartan-IIs aboard.

Fall of Reach
"Kelly-087"

- Fred-104

On August 30, 2552, Fred was assigned on in the Epsilon Eridani system as part of the Spartan-II contingent of Operation: RED FLAG, an ONI operation with the objective to capture a Covenant Hierarch. However, the mission was aborted as all ships were ordered to defend Reach from a massive Covenant assault. John assigned Fred to lead Red Team, which was sent to land on the ground and protect the power generators for Reach's orbital defense platforms. As Red Team's Pelican—Bravo 001—descended to the surface of the planet, the dropship was attacked by Seraphs and dove uncontrollably towards the ground. Fred ordered Red Team to jump from the Pelican and the resulting impact killed four of the Spartans on Red Team; however, if they had not jumped, all Spartans would have died as Bravo 001 exploded shortly after. After regrouping and eliminating several small Covenant patrols, the Spartans traveled to Orbital Defense Generator Facility A-331, where they met with the four survivors of the nearly destroyed Charlie Company. While Red Team was building defenses at the facility, they received a distress call from Vice Admiral Danforth Whitcomb, Deputy Chief of Naval Operations.

Fred then divided his Spartans into four teams: himself, Kelly, and Joshua-029—comprising Team Alpha—were to destroy a nearby Covenant landing zone at Longhorn Valley, while Team Gamma, led by Anton-044 with two other Spartans, would rescue Vice Admiral Whitcomb and his staff. Team Delta, led by William-043 and consisting of the wounded Spartans and the Marines would secure a fallback position at CASTLE Base and the fourth team, Team Beta, consisting of the rest of the Spartans, would defend the ODG facility. Operating Type-26 Banshees, Fred and Team Alpha successfully destroyed the landing zone by delivering Fury tactical nukes into the gravity lift of a Covenant cruiser overhead. However, Joshua was killed in the resulting explosion and Team Beta at the ODG facility appeared to be wiped out by Covenant battleships and cruisers glassing the area. Fred and Kelly then retreated to the fallback position, which was surrounded by Covenant forces. The two Spartans were forced to commandeer Type-26 Wraith tanks, and they successfully arrived at CASTLE Base with some support from Team Delta's survivors—Will, Vinh-030, and Isaac-039. After Kelly whistled Oly Oly Oxen Free into the base's speakers, they were able to enter the facility where they encountered Halsey. Despite the injuries Fred and Will suffered, with Fred having a torn Achilles tendon, three cracked ribs, and moderate contusions in both kidneys, Halsey had the two Spartans travel to another section in the base to retrieve some equipment, as they were the least injured among the Spartans. After the two treated some of their injuries, Fred and Will retrieved new weapons and parts of the Mark V Mjolnir to repair their damaged armor.

As the Covenant attempted to make their way into CASTLE Base, the five Spartans and Halsey were forced to destroy the facility as part of Operation: WHITE GLOVE. The group escaped into abandoned mining caverns under Reach's surface, while CASTLE Base exploded behind them. However, once inside the caverns, the group found themselves trapped underground for several days, until they came across a Forerunner installation, where they discovered a mysterious Forerunner crystal. The artifact created a spike in radiation that allowed the Covenant to triangulate their position. The Covenant breached the underground complex, and used a gravity lift to send massive amounts of ground forces to the humans' location. The humans then ran into a cavern and blew up the entrance, resulting in the presumed deaths of Vinh and Isaac. However, the cavern only led to a dead end and for two days Fred, Kelly, Will, and Halsey were trapped in the cavern as the Covenant tried to dig them out.

Operation: FIRST STRIKE
"Naval Intelligence officer"

- Fred-104

When the Covenant eventually began laying siege to their position, Fred, Kelly, Will, and Halsey were rescued from the underground complex when John, Anton, Li-008, Grace-093, Whitcomb, Lieutenant Elias Haverson, Staff Sergeant Avery Johnson, and Corporal Locklear arrived at their location and helped eliminate attacking Covenant forces. However, the entire group soon found themselves surrounded. In the resulting battle, Kelly was injured and the group was extracted from the area by a Covenant dropship operated by Shiela Polaski. Escaping Reach with the Forerunner crystal, the group fled Reach aboard the dropship to the captured Covenant carrier Ascendant Justice, fused together with the  for power and commanded by "smart" AI Cortana.

Fred's injuries were finally treated aboard Gettysburg, where the severely injured Linda was also located. He then took part in the Spartans' extra-vehicular mission to repair a plasma conduit on the ship, holding his own against cloaking Sangheili as well as the dangerous rampant plasma bolts floating around the slipspace bubble the ships were trapped in as a result of the Forerunner crystal aboard. After repairing the conduit, Polaski picked up the group in the Covenant dropship but, while returning to Ascendant Justice, a stray plasma bolt hit the dropship, killing Anton, Li, and Polaski and rendering Fred and the surviving Spartans unconscious. The Spartans were eventually brought back aboard Ascendant Justice–Gettysburg, and the ship hybrid eventually escaped the Covenant by returning to normal space. The Spartans recovered aboard Gettysburg, where they learned that the Covenant had discovered the coordinates to Earth; furthermore, the Forerunner crystal emitted a deadly radiation in slipspace that would kill the crew by the time they arrived at Earth. Seeking both an alternative way to Earth and repairs for Ascendant Justice–Gettysburg, the ships traveled to the Eridanus system to request aid from the United Rebel Front at Eridanus Secundus, with Fred helping Whitcomb and Haverson man the ships' stations.

Arriving at Eridanus Secundus on September 12, 2552, Fred and John accompanied Whitcomb, Halsey, and Haverson into the asteroid after the URF, under the leadership of Governor Jacob Jiles, reluctantly agreed to repair Ascendant Justice–Gettysburg. As the group discussed the current situation with Jiles, a Covenant cruiser suddenly arrived in the system, having tracked Ascendant Justice–Gettysburg by following the radiation emitted by the crystal in slipspace. Fred and the others returned to their ships to combat the cruiser, with Fred manning the engineering station of Gettysburg. The humans were eventually able to destroy the cruiser and Jiles agreed to have the URF repair their vessels before the next wave of Covenant ships arrived. Fred and the rest of Blue Team, including the recently healed Kelly and Linda, were then given some time to rest and repair their equipment, where they discussed their next best course of action with Johnson and Locklear. They realized that the Covenant fleet headed to Earth was grouping at Unyielding Hierophant—a command-and-control station in the Tau Ceti system—and decided that attacking the station would be the best way to weaken the Covenant's inevitable attack on Earth. While preparing for the Covenant's next attack, Halsey sedated Kelly and left the system with her aboard Jiles' flagship to follow coordinates she had taken from Colonel James Ackerson that led to a world with numerous pieces of Forerunner technology. Shortly after, Locklear destroyed the Forerunner crystal to prevent it from falling into Covenant hands, killing himself in the process. Ascendant Justice–Gettysburg and its crew were ultimately forced to abandon the URF when a fleet of thirty Covenant ships arrived at the asteroid. The Spartans then began to enact Operation: FIRST STRIKE.

The next day, the Spartans were deployed from Ascendant Justice–Gettysburg in a Type-25 Spirit dropship while in slipspace. The dropship exited slipspace and arrived at Tau Ceti, where Fred and Blue Team infiltrated Unyielding Hierophant with assistance from Cortana. While traveling to the station's reactor, Blue Team was ambushed by Jiralhanae and Grace was killed. After eliminating the Covenant soldiers, Fred and the surviving Spartans set the station's reactors to overload. Fred then escaped Unyielding Hierophant with John, Will, and Linda aboard Banshees, where they rendezvoused with Gettysburg—now detached from Ascendant Justice and equipped with the Covenant carrier's slipspace drive—at a nearby moon. While Whitcomb and Haverson sacrificed themselves to lure the Covenant fleet closer to the station in Ascendant Justice, the Spartans escaped to Earth on Gettysburg with Johnson. The detonation caught almost the entire fleet in the explosion, with all but twelve ships being destroyed in the blast.

Battle of Earth
"Terrence Hood"

- Fred-104

Shortly after their return to Earth, Gettysburg docked with the Borneo Space Tether and Fred and Linda descended the space elevator to report on Operation: FIRST STRIKE to a council of ONI officers, where they warned them of the Covenant's inevitable invasion of Earth. During the opening stages of the Covenant invasion of Earth, Fred was subjected to a psychological analysis by ONI's Doctor Veronica Clayton. The doctor became increasingly vitriolic toward Fred, seemingly blaming him for the deaths of his teammates at the Fall of Reach after giving the order to jump from Bravo 001. However, Fleet Admiral Terrence Hood, who had not authorized the analysis, soon arrived and had Clayton escorted away. He then told Fred to return to Blue Team and assist in Earth's defense.

As the Battle of Earth begun, Fred, Linda, and Will were sent to defend Earth for two weeks shortly after the Covenant arrived in the Sol system on October 20, 2552; John had followed the High Prophet of Regret's Solemn Penance to Halo Installation 05 aboard shortly after the battle began. Blue Team participated in several extra-vehicular missions to repel Covenant ships in orbit over Earth, as well as several missions on the planet's surface; including, an operation to Mount Erebus to neutralize a Covenant excavation with a HAVOK nuke, and to the Yucatan Peninsula to eliminate Covenant forces on the nearby seafloor. On November 3, 2552, Blue Team was deployed to Havana, Cuba to eliminate Covenant forces attacking the Centennial Orbital Elevator. While Fred secured the elevator's ascent car, Will and Linda destroyed a Type-47 Scarab with a gasoline tanker truck. Discovering that the Covenant was attempting to steal twelve FENRIS nuclear warheads, Blue Team ascended the elevator and requested a low-orbit extraction. However, Hood contacted them and ordered Fred to led Blue Team to Onyx to assist Halsey, who claimed that she had discovered a large cache of Forerunner technology on the planet. When the Covenant deployed dropships to retrieve the nukes, Blue Team hid aboard one and the Covenant inadvertently brought them aboard Bloodied Spirit. While some of the nukes destroyed another Covenant destroyer and the space elevator in the process, Fred and Blue Team fought their way through Bloodied Spirit and eventually reached the bridge, where they killed its crew by venting the destroyer's atmosphere. Fred inputted coordinates to Onyx in the Zeta Doradus system into the destroyer's navigation computer and Bloodied Spirit entered slipspace for the planet.

Battle of Onyx
"As acting CO of Team Blue, I am hereby granting you a field commission to the rank of Lieutenant, Junior Grade. Congratulations. As an officer, you'll have to keep your eye on the larger picture, Fred. Get your team through that slipspace field. I'll be right behind you."

- Lieutenant Commander Kurt-051 promoting Fred-104 to lieutenant at the end of the Battle of Onyx

While en route to Onyx, Bloodied Spirit was brought out of slipspace by the Covenant, where the destroyer was forced into a conflict between Sangheili heavy cruiser Incorruptible and three Jiralhanae frigates as the Great Schism emerged within the Covenant. While Bloodied Spirit was able to escape the conflict, the Covenant learned that the destroyer was under Spartan control. However, Shipmaster Voro 'Mantakree of Incorruptible had intercepted Halsey's message and learned of the Forerunner cache on Onyx. 'Mantakree later met with a coalition of allied Sangheili, where Imperial Admiral Xytan 'Jar Wattinree charged 'Mantakree with leading a fleet to recover the Onyx technology. Upon arriving at Onyx, Bloodied Spirit was engaged by Onyx Sentinels in orbit. As the ship crashed on the surface, Blue Team escaped in a Spirit dropship. On the surface, Fred, Will, and Linda regrouped and soon met with Kelly, who had been brought to Onyx with Halsey after the events in the Eridanus system. Kelly brought them to the thought-to-be-dead Kurt and the five Spartan-IIs began running to evade the oncoming Sentinels, with the help of Spartan-III Team Saber of Gamma Company. The Spartans rendezvoused with Halsey, Mendez, and Lucy-B091 and Tom-B292 of Beta Company, where Kurt explained to his fellow Spartan-IIs and Halsey that he and Mendez had spent the last two decades training the Spartan-IIIs on Onyx. With Kurt taking command of all UNSC forces, the Spartans began combating the Sentinels.

Returning to Blue Team's dropship, the humans embarked towards a Forerunner city within the restricted Zone 67 aboard the Spirit. Landing in the city, Kurt had Fred, Linda, and Holly-G003 and Mark-G313 of Team Saber scout out the surrounding area with grappling rounds while the others examined Onyx's map room, located by Will. Just as Halsey located the missing Team Katana's location on Onyx, now-Fleet Master Voro Nar 'Mantakree's fleet arrived at Onyx while a massive force of Sentinels hovered overhead above the humans. 'Mantakree led Sangheili, Mgalekgolo, Kig-Yar, and Unggoy ground forces to the planet's surface while the humans prepared to fend off their attackers. During the ensuring battle, Fred was hit in the chest by a Mgalekgolo's assault cannon, injuring him. He was pulled to safety by Lucy and Saber's Dante-G188, as he recovered. The humans moved to the map room for cover, though Dante was killed. Discovering that they could escape Onyx in the planet's core via a slipspace portal that was about to close, Halsey utilized Onyx's slipspace translocation system. Before they could teleport to Team Katana's location, Onyx AI Endless Summer revealed that the Sentinels would destroy Admiral Carl Patterson's battle group in orbit after they inevitably destroyed the Sangheili ships. Realizing that the battle group was sent to rescue the Spartans, Kurt agreed with Endless Summer to destroy the Sentinel manufacturing facility to give the battle group a better chance of survival. The Spartans were subsequently teleported to the facility, where they succeeded in destroying it. However, the humans soon learned that Patterson's battle group had been destroyed with the arrival of a larger Sangheili fleet. Fred and the others then recovered Spartan-III Team Katana, though the Spartans were trapped in slipspace field pods. Afterwards, the humans headed for Onyx's core room and made a final stand against the Covenant forces at a slipspace portal which Halsey theorized to lead into a "shield world".

As 'Mantakree led an assault on the core in an effort to claim Onyx for himself, the Spartans attempted to repel the aliens as the slipspace portal began closing. During the battle, both Holly and Will were killed and several of the Spartans were severely wounded. With the humans being overrun, Kurt ordered everyone to retreat into the slipspace rift while he would stay behind to ensure their attackers did not follow them. Before Fred and the rest of Blue Team entered, however, Kurt promoted Fred to the rank of lieutenant, junior grade and gave him command of Blue Team. While Fred, Mendez, Halsey, and the other surviving Spartans—consisting of Kelly, Linda, Tom, Lucy, Mark, Ash-G099, Olivia-G291, and Team Katana—traveled through the portal, Kurt sacrificed himself to wipe out 'Mantakree's forces.

Post-Covenant War operations
"Dante and Holly gave their lives fighting. Kurt stayed behind and made sure the Covenant wouldn't follow us. Now it's our duty to complete the mission: find Forerunner technologies and get them back to Earth. Doing anything less would dishonor their sacrifices."

- Fred-104 to Catherine Halsey, following the Battle of Onyx

Having passed through the slipspace rift, Fred and the rest of the human survivors found themselves inside a massive Dyson sphere contained within a slipspace bubble of compressed space-time in the heart of what used to be Onyx. After the Spartans, Halsey, and Mendez held a funeral for their comrades that had died in the battle at Onyx, Fred led them to search for Forerunner technologies and a way to return back to Earth. After the survivors had explored the sphere for several days—over three months in normal space-time—they discovered a group of Huragok which helped them establish contact with the ONI ships outside the sphere and eventually bring the sphere back into normal space. They were then recovered by the ONI team Kilo-Five led by Captain Serin Osman and taken to a debriefing in HIGHCOM Facility Bravo-6 aboard prowler. Fred, along with the rest of the surviving Spartan-IIs, were present in the Voi Memorial ceremony at Kenya, Earth on March 3, 2553.

Following their recovery from Onyx, Fred led Blue Team—now comprising of Kelly, Linda, Tom, Lucy, Ash, Mark, and Olivia—on several operations. In the post-war era, Blue Team was deployed to the outer fringes of human space to eliminate hostile Covenant remnant factions. These highly classified operations lasted for several years and were under ONI's direct oversight. One of these operations saw Fred and Blue Team rescue Unified Earth Government diplomatic personnel and eliminate several insurrectionists on the human colony of Andesia. Fred also participated in Operation: CARRION HEART, though the specifics of this mission remain highly classified.

Conflict on Gao
"Welcome aboard, Inspector Lopis. You're one of the good guys now."

- Frederic-104 to Special Inspector Lopis, as they depart Gao

In May 2553, Blue Team was attached to ONI's 717th Xeno-Materials Exploitation Battalion. The research battalion was deployed to the Outer Colony of Gao to search for Forerunner ancilla Intrepid Eye, an that had been detected on the planet by the battalion's Commander Murtag Nelson. The UNSC's presence on the planet was largely undesired by the traditionally independent Gao. Upon learning of the UNSC's intent to capture her, Intrepid Eye began murdering Gao citizens in the Montero Cave System in an effort to create distrust and discord throughout Gao. The Gao Ministry of Protection was tasked with finding the murderer and Nelson had members of Blue Team aid Special Inspector Veta Lopis in her efforts to allow the UNSC to return searching for the ancilla without Gao interference. During the investigation, Lopis became certain that the murderer was one of the Spartans and often pestered Fred for details on the battalion's mission, much to the Spartan's annoyance. On July 4, 2553, Fred, Ash, Olivia, and Mark were exploring the Montero Cave System alongside Lopis and her partner Cirilo, where they discovered the bodies of Major Ira Halal and Private Hayes, who had been murdered by Intrepid Eye. While exploring the surrounding area, the last four remaining Sentinels attacked the humans while Intrepid Eye watched nearby. Though the Spartans were able to destroy the Sentinels, Cirilo was killed and Olivia was wounded. The ensuring battle resulted in a rockslide, preventing them from retracing their steps. Ordering the others to stay in a small cavern, Fred left to investigate the cave-in.

Upon returning to the area of the cave-in, Fred discovered Intrepid Eye's damaged Covert Support Base 4276. The facility's corrupted vacuum energy extractor unleashed a "cyclone of quantum fury", warping space and time for Fred when he neared the base. While over two hours had passed, Fred had only felt the passing of ten minutes. Wary of exploring the mysterious facility alone, he left to regroup with the rest of his team to return to the surface and report to Nelson, along with the recently discovered Lifeworker Huragok Roams Alone. While the group continued towards Gao's surface, the battalion's encampments at the Montero Vitality Center and at the village of Wendosa was attacked by insurrectionists and the Keepers of the One Freedom, who sought to take Gao's ancilla for themselves. Meanwhile, the Gamma Company Spartan-IIIs had run out of their "Smoothers", drugs that controlled their more unpredictable augmentations. After having lost contact with Mark who was supposed to scout the area ahead, Fred, Ash, and Roams Alone departed to look for him. The three soon encountered dead Keeper forces killed by Mark. Meanwhile, Mark had returned to Olivia's and Lopis' position, helping the two fight off hostile forces.

Once the team regrouped, they fought their way past Keeper forces as they attempted to return to the surface. Seeking to be caught in order to gain access to UNSC communications, Intrepid Eye revealed herself to Fred in her inspection drone shell and allowed him to capture her with a scramble grenade. Finally returning to the surface at Wendosa, Fred created a plan to attack the Keepers and aid the battalion and the rest of Blue Team under attack at the village. In the ensuring firefight, Intrepid Eye convinced Roams Alone to free her and she escaped, jamming all communications on the planet. Fred pursued the ancilla and recaptured her, only to find Mark—now paranoid and aggressive without his Smoothers—holding a knife to a Marine sergeant. After coaxing Mark to release the Marine, the sergeant informed Fred that he was to return to the Vitality Center with the ancilla. Reluctantly boarding a Falcon, Fred departed for the center, but the aircraft was shot down by Keeper forces. While Keeper forces attacked the crash-site to retrieve Intrepid Eye, Fred's armor's mechanical joints locked up, preventing him from moving. Blue Team and Lopis arrived at the crash and, with the eventual help of Alpha Company, fended off the Keepers. Fred and the other injured Spartans were later brought to the Vitality Center to recover. Meanwhile, the Gao Republic's militia attempted to forcefully remove the UNSC from the planet by attacking the battalion.

While the UNSC was preparing to evacuate, Intrepid Eye murdered Nelson and attempted to kill Lopis, but the ancilla was disabled by a Marine and Fred rescued Lopis. Determined to prevent the support base from falling into the hands of Gao rebels, Blue Team, Lopis, and Roams Alone embarked to destroy the facility with a HAVOK nuclear warhead, while the rest of the battalion evacuated. Pursued by Gao battle-jumpers and Wyverns, the team traveled to the support base's entrance at the Well of Echoes in Warthogs. During the battle, Roams Alone departed from the rest of the team to tend to Gao's wildlife, while Intrepid Eye managed to take control of Fred's armor and attempted to kill Lopis. However, Lopis detonated a small charge she had earlier placed in Fred's armor in case he was the Gao murderer, leaving the armor powerless and forcing Fred to abandon it. Finally arriving at the Well of Echoes, the team dropped the nuke into the entrance and is then evacuated aboard Owl Silent Claw, commanded by Osman. With Intrepid Eye successfully captured, the UNSC left Gao. To avoid the public finding out about the dangers of the Gamma Company Spartan-IIIs' augmentations, Osman had Ash, Mark, and Olivia officially marked as killed in action and transferred to a classified black operations team of which she gave command of to Lopis, much to the rest of Blue Team's reluctance. Shortly after, Tom and Lucy were transferred from Blue Team to the emerging Spartan branch.

Skirmish on Gamma Halo
"I will allow you a moment more to fire the weapon, human. I will grant you the gift of dying a warrior."

- The Ur-Didact to Fred-104, allowing Fred to shoot him with a Boltshot

On July 26, 2557, Fred, Kelly and Linda were reunited with John-117 after he returned from the Forerunner shield world of Requiem. Shortly after the Didact's defeat at the hands of John over Earth, Fleet Admiral Hood tasked Blue Team with a mission to investigate an attack on a local science team and Black Team on Installation 03, with John serving in an active role rather than advisory despite Hood's suggestions. Traveling to the installation, Blue Team landed near the UNSC facility on the Halo aboard a Longsword, where Linda found tracks left by a Promethean Crawler. Arriving at the facility, Blue Team soon found the bodies of Black Team and the scientists. After John noted to his squadmates that he doubted the Crawlers could kill four Spartans, Blue Team was attacked by Promethean Knights. Blue Team quickly destroyed the Knights, with Fred stabbing one in its "head", killing it. They continued following the Crawlers' tracks and came to where the Composer was originally located. Kelly found a tunnel which they followed down, soon finding the Composer's Abyss where they entered a slipspace portal.

The Spartans arrived in a deserted Forerunner city where they soon discovered the Composer's Forge and six intact Composers housed therein. The Spartans were then confronted by the thought-to-be-dead Didact and a firefight broke out between them and the Didact's newly created Promethean machines. While Fred and the other Spartans battled the Prometheans, the Didact had monitor 859 Static Carillon bring Installation 03 to the Composer's Forge and departed to the Halo installation with one of the Composers, intending to use the device as well as Gamma Halo against Earth. Disgusted by the Didact's actions, Static Carillon informed Fred and Blue Team of the Didact's plan, and the Spartans pursued the Forerunner through the portal back to Installation 03. Upon their return to the surface, the Didact attacked the Spartans, intending to kill them personally. The Didact threw John into Fred, and Linda and Kelly attacked the Forerunner. He blasted Kelly away and tackled Linda to the ground, disabling the Spartans. The Didact allowed Fred to shoot him in the head with a Z-110 Boltshot—to no effect—so he could give Fred the honor of "dying a warrior". However, before the Didact could finish them off, Static Carillon appeared behind the Forerunner and disabled him with his laser. The monitor then teleported the Didact to Gamma Halo's control room to prevent him from killing the Spartans. While John went to pursue the Didact, Fred and the rest of Blue Team returned to their Longsword. After John successfully "contained" the Didact by way of subjecting him to the fields of multiple Composers, Static Carillon teleported himself and John into Blue Team's Longsword. Fred asked the monitor where the ring would be taken, but no response was given; Static Carillon then left to repair the ring and Blue Team returned to Earth.

Returning to Earth, John was debriefed by Hood, where the fleet admiral gave orders for Blue Team to have some rest after years of combat. However, the rest of the team instead left to take on new missions, all of them highly classified, wherever they were needed. At some point, the four Spartans returned to the glassed remains of Reach, where they recalled their past and paid their respects to Sam.

A new conflict arises
"They won't court-martial all of us, right?"

- Fred-104, after agreeing to help John-117 find Cortana

After the loss of contact with Office of Naval Intelligence's research and development station Argent Moon, Fred and the rest of Blue Team were deployed by to recover the facility on October 23, 2558; the station had been rediscovered when a group of Kig-Yar scavengers sold it to Jul 'Mdama's Covenant. Using a D79-TC Pelican to travel to the station's position within a dense asteroid belt, the four Spartans left the dropship and used their thrusters to reach Argent Moon. As they neared, Fred and Blue Team fired their weapons to weaken a glass window in the station before smashing through it themselves, ejecting the Covenant forces inside the room into space while the Spartans activated their magnetic boots to stay in place.

The Spartans fought their way through the station, clearing it of Covenant occupants. During the engagement, John received an apparent vision from the thought-to-be-dead Cortana, simply warning him that "Meridian was next". John informed his teammates of this, though Fred asserted that it was impossible, since John himself confirmed her death over Earth the previous year. Setting the vision aside, Fred and Blue Team attempted to continue their salvage mission until a large Covenant fleet arrived in the system, bringing word of 'Mdama's death on Kamchatka. Deciding Argent Moon was no longer salvageable due to the presence of the Covenant fleet, John switched the mission to asset denial, and the Spartans used Covenant Type-54 Banshees to damage the reactor and trigger an overload. Mission accomplished, John reassigned himself to Meridian to investigate Cortana's message, against the orders of Infinity, after learning the UNSC was already planning to do the same. He attempted to convince Blue Team that they did not need to follow him, but all three members declared their solidarity with him and joined him aboard the prowler ONI Acrisius, which they used to escape the self-destructing Argent Moon, avoid the Covenant fleet, and depart for Meridian in the Hestia system.

The very next day, the UNSC listed Blue Team as absent-without-leave. Fireteam Osiris, a Spartan-IV unit led by Spartan Jameson Locke, was tasked by the UNSC Security Council with recovering Blue Team and Acrisius. Upon arriving at Meridian, Blue Team landed at Apogee Station and were directed to the mines of the world by Meridian's Governor Sloan—a smart AI aligned with Cortana—where a dormant Guardian lay buried. Blue Team's arrival was witnessed by multiple colonists, who were wholly unaware of their intentions. Also unbeknownst to the people of Meridian was the fact that Sloan purposefully ensured nobody tried to stop them. Blue Team encountered no resistance from the mechanical Prometheans that were protecting the Guardian, under Cortana's orders. Cortana had Fred and the rest of Blue Team make their way to a Guardian which would take them to her position. As the Spartan-IIs prepared to board the Guardian, Osiris arrived at their position and attempted to halt them. While Fred, Kelly, and Linda proceeded to enter the portal leading to the Guardian, John lingered and had an altercation with Locke. Once John had dealt with him and resumed boarding, the Guardian began to awaken. Fireteam Osiris scrambled to escape the collapsing cavern it had been held in as it rose out of the ground. The Guardian caused massive amounts of destruction to Meridian's settlements as it took to the air, both from the very fact that it was emerging from beneath the earth and from electromagnetic shockwaves it sent out continually. During this time, many Prometheans were deployed from the Guardian to engage Fireteam Osiris as they moved to escape the destruction in their Pelican. The Guardian eventually jumped to slipspace on a course for Cortana's location, taking Blue Team with it.

Cortana and the Guardians
"Chief, back on Meridian—there was a lot of destruction. There were civilians."

- Fred, expressing concern at the collateral damage of awakening a Guardian

Arriving at the Forerunner world of Genesis, the Spartans disembarked from their Guardian and landed on the planet's surface. Fred questioned John as to why Cortana would have brought them there, though he did not receive an answer. As Blue Team moved out to explore the planet, they encountered terminals that emitted an audible "Oly Oly Oxen Free" signal. Interfacing with the terminals to continue their search for Cortana, Fred made note of the enormous casualties that the Guardian had inflicted on Meridian, though Kelly argued that Cortana may not have know that they would be the result of its activation. Proceeding further, Fred alerted the team to the presence of Covenant scattered across Genesis, drawn through the slipspace portals of other Guardians activated across the galaxy. Quickly eliminating the small pockets of Covenant forces, Blue Team encountered a clearing filled with a significant number of dead Covenant soldiers, and were confronted by the Warden Eternal, who introduced himself as keeper of the Domain and Cortana's protector. The Warden translocated Promethean forces to the area to try to kill Blue Team, declaring that while Cortana wanted them to ally with her, he perceived them as a severe threat to her plan.

Fighting through the Promethean forces, Blue Team was finally contacted by Cortana, who expressed relief and joy to see them. Cortana explained that she had survived her apparent destruction at Earth by being pulled into slipspace aboard a chunk of Mantle's Approach, the ship of the Didact that had attempted to enter slipspace to flee its concurrent destruction. Arriving on Genesis, Cortana managed to access the Domain and "cured" herself of rampancy. Moreover, she explained that the cure for rampancy had inspired her to take up the Mantle of Responsibility alongside her fellow AIs, calling themselves the Created. The Created was to strategize and coordinate in the long term to benefit the galaxy and usher in an age of peace and stability. Fred initially believed that Cortana's plan had some merit and did not understand why the Warden expected them to oppose it, but John asserted that the Didact made it clear that the Mantle could lead to brutal imperialist oppression, a suggestion which Cortana dismissed off-handedly. Cortana claimed that she explain her plan better once they were together and she directed them to Genesis' Gateway. Utilizing Promethean Z-1800 Phaetons, Fred and Blue Team embarked towards the Gateway. Once they reached the facility, Blue Team stepped through another slipspace portal which teleported them to the Gateway's interior. However, Cortana was waiting for the rest of her Guardians to arrive at Genesis and instead had Blue Team wandering around the Gateway in circles for hours. At this time, Fred and Blue Team came to the realization that Cortana was truly dangerous.



While in the Gateway, Blue Team was unexpectedly contacted by Osiris, who had activated a Guardian under Sunaion on Sanghelios in order to reach Genesis. Locke insisted that they were there under orders from Doctor Halsey to assist, rather than capture them, and that Cortana was deliberately activating Guardians across known space. Cortana blocked further radio contact with them before Locke could explain any further. Genesis' monitor, 031 Exuberant Witness, directed Fireteam Osiris to Blue Team's position and when the Spartans met up, they agreed to work together. However, Cortana promptly teleported Blue Team out of the area. Now at another part of the Gateway, Blue Team was attacked by the Warden again, though Cortana quickly dissolved his physical form. However, the Warden remained determined to stop the Spartans and sent Prometheans to engage them. Blue Team continued to angrily question Cortana on her plan, with the Warden using the questions as proof of the Spartans' disloyalty to her. The Warden himself continued to attempt to engage the Spartans, though most of his efforts were thwarted by Cortana. Eventually, Fred and Blue Team reached Cortana's position, where she revealed herself now in a physical, hard light body. Rejecting Cortana's plan, John ordered her to stand down and return to Earth with them. Cortana refused and sealed Blue Team in a Cryptum, intending to keep them in stasis for 10,000 years while she enacted her plan. As Cortana dispersed her Guardians across the galaxy to carry out the Created's rule, Cortana herself prepared to leave in a Guardian with Blue Team's Cryptum. However, Fireteam Osiris and Exuberant Witness succeeded in freeing the Cryptum seconds before Cortana departed Genesis. The monitor had Constructors free Blue Team from the Cryptum, and the Spartan-IIs approached Osiris. Locke revealed that Cortana and her Guardians were gone, and eventually the Spartans left Genesis for Sanghelios to rendezvous with Halsey, Spartan Sarah Palmer, and Arbiter Thel 'Vadam to discuss their next move now that Cortana and other AIs were commanding numerous Guardians throughout the galaxy to enforce the Mantle.

Personality and traits
"Ira Halal"

Frederic-104 is a natural leader and a brilliant strategist. Highly intelligent, alert, and objective-focused during operations, Fred often appears solemn and stoic when interacting with other personnel of the United Nations Space Command. However, he had difficulty hiding his emotions at times, a trait that Doctor Catherine Halsey was aware of. A quick thinker, Fred has learned to rely on his instincts while on patrol or in the heat of a battle, noting that it had saved his life from dozens of ambushes. His augmentations and training has crafted Fred into one of the UNSC's greatest military minds. He is very observant; after years of watching soldiers face their fears, Fred is able to identify tell-tale signs of individuals encountering their fears and weaknesses, such as loss of focus and body tension. He did not always agree with or trust the judgement of his commanding officers, though Fred remains respectful to his superiors. However, he refuses to be intimidated by "key-tapper" officers, jesting that the day he is will be the day he turns in his armor and resigns. Despite his stoic and serious demeanor, Fred occasionally makes jokes or sarcastic quips in the midst of a battle or mission, once jesting to Major Ira Halal that it is "an operational bug".

As a Spartan, Fred has a strong sense of duty and commitment towards the UNSC and his closest peers, and is always to accomplish the goals set before him and achieve victory in ever tactical situation. As with many of his fellow Spartan-IIs, Fred preferred to fight on a world's surface rather than in zero-gravity environments that were typically encountered in off-world operations. Regardless, Fred often chose to volunteer for space operations as he sought to participate in missions that presented greater threats and dangers. Fred was always eager to battle the Covenant to defend any world, though he was particularly determined to save Reach, viewing the planet as an invaluable military resource and his home. Fred noted that other personnel of the UNSC looked upon Spartan-IIs with awe, suspicion, and fear. However, Fred, like many of the Spartan-IIs, dislikes the special treatment he and the other Spartans receive from ordinary humans and does not elevate himself above baseline troops, believing they all served the UNSC for the same reasons. Fred is ever pedant in following protocol; during his operation on Gao, Fred was irritated that several of his superiors continued to violate Foxtrot Tango Angel 7012 by revealing classified information on the Forerunners to civilians. Although Fred's service with the UNSC throughout the Insurrection and Human-Covenant War has left him as a highly decorated individual, he refrains from wearing his awards.

Although his conscription into the SPARTAN-II program prevented him from living a normal life, Fred feels no resentment towards Halsey nor Mendez. He believes that had he lived a normal life, he might have been killed by the Covenant and his career as a Spartan has instead enabled him to fulfill his full potential. In an "interview" with Doctor Veronica Clayton, Fred stated that he would never ask to change who he was and was proud to be a Spartan. When given the offer to access his file on his origins and past life, Fred declined.

Leadership and responsibilities
"I'm secure in my role and and the tactical decisions I make before, during, and following combat, and so are my peers."

- Frederic-104 to Doctor Veronica Clayton, shortly before the Battle of Earth

Frederic-104 is a tactically proficient and strategically capable leader, having displayed these characteristics throughout the Human-Covenant War. While also serving as an incredibly effective combatant, Fred specializes in strategy, information management, and using his leadership skills to transform disparate combat units into a comprehensive fighting force, even when he only has access to the barest information on troop dispensation. Fred has a stabilizing influence on the morale of those under his command, a trait that is of interest to Office of Naval Intelligence psychologists.

Fred cares greatly for those under his command, regardless of whether they are Spartans, Marines, or other UNSC personnel and he took full responsibility of their lives, bearing a heavy, personal burden with each casualty. He would ensure the safety of his team before even considering his own well-being; Fred once noted that he could only think clearly when the safety of his team was at stake. During the battle at Wendosa, Fred was reluctant to follow orders to evacuate, as he would be leaving behind those under his command. Fred was willing to defer command and leadership to those that he both respected and trusted. During the Battle of Onyx, while Fred was given command of Blue Team, he was quick to respectfully relinquish his command to Lieutenant Commander Kurt-051. After Blue Team reunited with John, despite being two pay grades higher than him, Fred allowed John to become the de facto leader of the unit, with John even attaining the call sign of "Blue Leader".

Often serving as a leader of Spartan fireteams, Fred has been noted to take the responsibility of his command with grim seriousness, empathizing too deeply with any wounded member of his team. During the Fall of Reach, Fred's quick-thinking and leadership ensured that the entirety of Red Team escaped their doomed Pelican before it was destroyed, though the resulting landing led to the deaths of four Spartans. Despite Kelly's support and that Fred had prevented the death of the entire team, he blamed himself for the deaths of these Spartans and felt disgusted with himself. After the death of Joshua-029, Fred bitterly thought to himself that Joshua's life was not worth the lives of the ten thousand Covenant soldiers killed in the same explosion. Ultimately, the Fall of Reach saw the highest single death count of Spartan-IIs, which severely affected Fred. In following engagements, he learned to adapt to severe casualties on the battlefield and is by many considered the most capable fireteam leader of all Spartans. Fred has since become confident in his role as leader and in the tactical decisions he made, as are his peers and subordinates.

Relationships
"Frederic-104"

- Kelly-087

Fred has close relationships with many of his fellow Spartans, particularly with fellow regular members of Blue Team. He is an ally and close friend to John-117, having trained alongside him since the early days of the SPARTAN-II program. Fred often defers to John for tactical direction. After learning that John was believed to be dead following the Battle of Installation 00, Fred was deeply saddened and commented that he never expected John to have died before him. Following Blue Team's reunion with John in 2557, Fred grew concerned over his friend's mental health as John restlessly continued to press himself during the missions Blue Team undertook. After John decided to go absent-without-leave to find Cortana, Fred and the rest of Blue Team willingly followed.

During the Covenant War, Fred often worried about the statuses of his fellow Spartans who were away on other missions. While the doubt eroded his confidence, Fred never mentioned his worries to his fellow teammates to avoid damaging their morale. Kelly-087 often served as Fred's second-in-command when John was not present. The two are close friends, with Kelly attempting to console Fred after his stress in battle led to him making the mistake of broadcasting orders across FLEETCOM 7 rather than a private channel. Fred was also close with Kurt-051 and was saddened by his supposed death in the Groombridge 34 system in 2531. After encountering Kurt on Onyx in 2552, Fred placed a hand on Kurt's shoulder as a rare emotional gesture among Spartans. After Fred realized Kurt's intent to sacrifice himself to allow the rest of Blue Team to escape through a slipspace portal, Fred was reluctant to leave his friend behind and the two ultimately parted ways by shaking hands before Fred stepped through the portal. Fred also had a close relationship with Will-043, with the two serving particularly closely towards the final months of the Covenant War. When Will was killed during the Battle of Onyx, Fred was quick to avenge his friend's death by killing the Mgalekgolo responsible. Afterwards, Fred grieved the death of Will and had some amount of difficulty with suppressing the rage he felt towards his Covenant attackers.

Like several other Spartan-IIs, Fred was initially wary of the abilities of the Spartan-IIIs. However, after witnessing their skill in combat during the Battle of Onyx, Fred was quick to accept them as fellow Spartans and welcomed Lucy-B091, Tom-B292, Ash-G099, Olivia-G291, and Mark-G313 as members of Blue Team; Fred noted that despite the young age of the Spartan-IIIs, he and the rest of the Spartan-IIs had also participated in combat operations at similar ages. After Ash, Mark, and Olivia were transferred to a different unit, Fred admitted that he and the rest of Blue Team would miss them. Having been largely raised by them throughout his childhood and his career as a Spartan-II, Fred considered Halsey and Mendez as maternal and paternal figures, respectively, and deeply respected them both.

Skills and abilities
"Alright, the Great Journey ends here."

- Fred-104 to Thel 'Lodamee, during Operation: WARM BLANKET

Frederic-104 is an incredibly skilled and experienced close-quarters combatant, and has gained a reputation for preferring combat knives in numerous combat scenarios. A superb soldier even for a Spartan-II and an excellent strategist, Fred's quick thinking has ensured his success in battle on numerous occasions. While Fred's combat prowess is never subject to question, his true specialty lies in strategy and leadership. During training contests, he almost always came in second place, with John-117 usually coming in first. John believed that Fred had the skill to come in first in these competitions, but Fred did not care for the resulting attention. While John assumed that Fred had the ability to rival himself in any set of skills, Fred lacked John's inherent luck. Due to his extensive training from Franklin Mendez, Fred was highly skilled in evasive movement and is able to easily avoid sniper fire in a combat environment.

Although he mostly focuses on and specializes in close-quarters and mid-range combat, Fred is also very proficient in long-range combat. Aside from Linda-058, Fred is the Spartan-IIs' second-best sniper and their best spotter. Fred was able to take on three Sangheili wielding Type-1 energy swords, including the skilled Major Thel 'Lodamee, using only his combat knives during Operation: WARM BLANKET. During the Battle of Havana, Fred was successful in engaging several Jiralhanae in close-quarters, despite the fact that Jiralhanae are capable of overpowering a Spartan. During the skirmish on Installation 03, Fred was quick to adapt to combating the new Promethean hostiles, engaging a Promethean Knight in close-quarters combat before destroying it with his knife and even using the Prometheans' own weaponry against them. Like his fellow Spartan-IIs, Fred had been trained in tracking as part of his Spartan Military Occupational Specialty.

Physical description
Frederic-104 stands at 216.3 centimeters (7 feet and 1.2 inches) with his armor and weighs 129.6 kilograms (286 pounds) without his armor. His face is described to be slender and handsome, with rugged features, a narrow nose, and covered in numerous scars. Fred has pensive blue-green eyes and thin eye brows, with high cheekbones. Veta Lopis noted that there was a sensitivity in his expression and that he was unexpectedly attractive for a Spartan. Fred has black hair with streaks of silver that first appeared after he underwent his augmentation procedures. When Fred was fourteen years of age, John-117 noted that he was "not too short or tall", slightly shorter than John, and neither too muscular, nor too slim. John-117 remarked that if any member of Blue Team could blend into a crowd, it would be Fred. Even prior to his augmentations, in 2523 at the age of twelve, Fred was tall and fit, appearing to be in his late teens or early twenties.

Equipment
"I'm wearing three layers of armor. Those man-droppers in your clip would just flatten themselves against my chest."

- Frederic-104 to Veta Lopis, during Operation: JOVIAN WHISTLE

Following his augmentation procedures and the beginning of the Human-Covenant War, Fred-104 was equipped with MJOLNIR Powered Assault Armor/Mark IV from Chi Ceti IV's Damascus Materials Testing Facility along with the rest of his fellow Spartans. Fred donned a developmental helmet permutation that shared visual cues with the armor variant that would eventually be known as the CENTURION-class Mjolnir variant. By 2526, Frederic wore the B variant of the MJOLNIR Mark IV armor. Later on, after upgrading to MJOLNIR Mark V armor by 2552, he wore the Commando-class variant of the armor. Upon his return to Earth following the Fall of Reach, Fred and the rest of the active Spartans were moved to the Mark VI generation of Mjolnir armor, with Fred specifically field testing multiple variants of the CENTURION-class Mjolnir, which incorporated many features which would later form the basis for Project: MJOLNIR's GEN2 platform. Like the rest of Blue Team, Fred's armor was fully upgraded to the GEN2 platform at some point following the Human-Covenant War. By July of 2553, Fred donned a blue-tinted CENTURION-class armor with gold detailing, which he continued to wear as of 2558.

Fred is often armed with a variety of weaponry that varies by mission and objective type. He is, however, often the member of Blue Team that is most frequently armed with heavy weaponry and explosives. During Operation: WARM BLANKET, Fred wielded an M6 Spartan Laser and he was later given control of Blue Team's explosives during the Battle of Sigma Octanus IV. As of 2558, Fred's preferred weapon loadout is an M395 Designated Marksman Rifle and the M6H2 magnum sidearm. He often carries one or more combat knives on him, due to his affinity for them.

Behind the scenes
"Otherwise, you just approach it like you do any other part—do the research, the history on the character, and figure out what his relationship is like with the Chief—and that sort of informs what it's going to sound like and then it's a collaborative process with everybody."

- Travis Willingham, on his portrayal of Fred

Frederic-104 was voiced by Andrew Love in Halo Legends '  The Package. Tony Giroux portrayed Fred in Halo 4: Forward Unto Dawn. Strangely, he is credited simply as "Spartan" in Forward Unto Dawn despite his significance. As of Halo 2: Anniversary's terminals, Fred has since been voiced by actor Travis Willingham, who notably had previously voiced Jul 'Mdama and Paul DeMarco. Willingham continued to voice Fred in Halo 5: Guardians, and also provided the character's likeness and performance capture. While Willingham also voiced Fred as an adult in Halo: The Fall of Reach - The Animated Series, Fred was voiced by as a child and voiced by Todd Haberkorn as a teenager. Laura Bailey, Willingham's wife and fellow voice actor, was cast as Olympia Vale in Halo 5: Guardians and received the role before him. As he had previously had a role in Spartan Ops, Willingham was unsure whether he would receive the role as Fred, though he ultimately received the part nonetheless. Willingham created his portrayal of Fred after doing the research on the character and learning of his relationship with John-117.

Frederic-104 first debuted in Halo: The Fall of Reach, released in 2001, and has since gained significant popularity. However, he did not make his first in-game appearance until 2015 in Halo 5: Guardians, where he appears as one of the game's eight playable characters. His unique base attributes are faster shield and health regeneration and the ability to carry one extra frag grenade. His appearance in the game was first alluded in the Halo 5: Guardians Multiplayer Beta, where the Centurion armor also donned by Fred had "104" stenciled on the chest plate in Braille.

List of appearances

 * Halo: The Fall of Reach
 * Halo: First Strike
 * Adjunct
 * Halo: Ghosts of Onyx
 * Halo Legends
 * The Package
 * Halo: Reach
 * Dr. Halsey's personal journal
 * Halo: Fall of Reach
 * Boot Camp
 * Covenant
 * Invasion


 * Halo: Glasslands
 * Halo 4: Forward Unto Dawn
 * Halo 4
 * Halo: Escalation
 * Halo 2: Anniversary
 * Terminals
 * Hunt the Truth
 * The Hunt Begins
 * Halo: Last Light
 * Halo: The Fall of Reach - The Animated Series
 * Halo 5: Guardians
 * Limited Edition