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January
January 17
 * A simulated trial hosted by AIs Roland and Black-Box is held to allow Iona to attempt to prevent her rampancy-preventing destruction. Afterwards, Iona is put into stasis, while the simulation is examined by human scientists.

February
February 1-7
 * Gek 'Lhar escapes ONI detainment facility Midnight, resulting in several fatalities and a heightened threat condition at the facility.

February 2
 * The charity fun run from the ship's stem to stern is scheduled to take place.

February 6
 * Gabriel Thorne is assigned to Spartan Fireteam Majestic.
 * UNSC Infinity leaves Earth orbit, headed for its second tour at Requiem with the mission to establish research facilities on the shield world.

February 7


 * UNSC Infinity arrives at Requiem. Commander Sarah Palmer, leader of the Infinity ' s Spartan contingent, sends various Spartan teams to the surface of Requiem. Marine, Army, and Navy assets are also deployed.


 * Operation: LAND GRAB: Fireteam Majestic is deployed to assist UNSC Marines in the initial assault on Covenant forces in location REQ-931 with the intent of securing a location for a research base.

February 8
 * Operation: ALL-SEEING EYE: Fireteam Majestic is deployed for a reconnaissance mission to identify a possible location for base establishment as well as gather data on any Covenant forces present.

February 9
 * Operation: CHATTERBOX: Fireteams Majestic and Crimson are deployed to locations REQ-814-B and REQ-814-D to remove Covenant forces in order to allow the UNSC to establish a base at REQ-626-C. Majestic is to begin by destroying a Covenant communications array at REQ-814-B.


 * A monthly poker night event is scheduled to take place aboard UNSC Infinity, with a grand prize of priority seating on all of the ship's internal shuttlecraft and trams.

February 10
 * Operation: ACADEMIC: Commander Sarah Palmer deploys Fireteams Majestic and Crimson to Requiem with the mission to assault a Covenant outpost and recover a Forerunner artifact. They are successful and the artifact is taken aboard Infinity.


 * After the Forerunner device teleports Chief Engineer Henry Glassman to the surface of Requiem, Dr. Catherine Halsey is brought in to investigate.

February 11
 * Operation: THREE-CARD MONTE: Fireteam Majestic, with support by Tower, Castle and Domino Teams, is tasked with with a search-and-destroy mission against Covenant outposts at locations REQ-822-A, REQ-822-B, REQ-822-C, and REQ-822-D.

Unknown date
 * The Forerunner artifact scans Infinity ' s systems and begins transmitting data to the surface of Requiem, where said data is intercepted by Jul 'Mdama. Glassman is taken captive by the Covenant and is ordered to activate the Librarian's shrine, though he is not successful.
 * Sangheili terrorist Parg Vol is assassinated by Fireteam Crimson.
 * Fireteam Crimson secure another Forerunner artifact, dubbed "the Didact's Gift". This device contains the memories of victims of the Didact's attack on New Phoenix six months prior. The processed human minds are to be repurposed as Promethean Knights. Spartan Gabriel Thorne is translocated to the Cauldron by the first artifact.
 * Dr. Halsey begins dialog with an unknown party who shares her interest in the Librarian. The intelligence is actually Jul 'Mdama, the Covenant's leader, who is manipulating Halsey into divulging vital secrets about the Forerunners. Halsey is apprehended after her unwitting communication with 'Mdama is discovered. Spartan Thorne rescues Dr. Glassman and the pair escape custody.
 * Dr. Halsey learns that John-117 is still alive. The Infinity is boarded by Covenant and Promethean forces who capture the doctor. They take her to the Librarian's "shrine", where 'Mdama awaits.
 * Gek 'Lhar, 'Mdama's lieutenant, is killed by Fireteam Majestic.
 * Admiral Serin Osman, head of the Office of Naval Intelligence, orders Captain Thomas Lasky to kill Dr. Halsey. Commander Palmer is to execute the order.
 * Lasky sends Fireteam Majestic to rescue Dr. Halsey and stop Palmer.
 * The Librarian gives Dr. Halsey the Janus Key, but Jul 'Mdama gets half of the key. Halsey gives Gabriel Thorne the other half before she is taken away.
 * Jul 'Mdama sends Requiem on a collision course with its sun, Epoloch. While the shield world is destroyed, the UNSC Infinity narrowly escapes the planet's slipspace conduit.
 * Dr. Halsey agrees to cooperate with Jul 'Mdama and his forces, stating that she wants revenge.

February 14
 * Infinity Atrium Park Valentine's Dance is scheduled to begin at 2015 hours.

February 18
 * A "Saturday Night (Cage) Fight" event is scheduled to take place aboard Infinity, with the Spartans of Sydney Team participating in a cage match.

February 21
 * Infinity Day, marking the one-year anniversary of the flagship's commissioning ceremony. Festivities aboard the ship are set to include a speech from Captain Lasky and Infinity-themed cupcakes.

February 25
 * A Chili Cook-Off organized by Master Chef Jonathan Lowell is scheduled to be held in Infinity ' s Forward Mess Hall.

March
March 3
 * Captain Lasky and Commander Palmer are debriefed by the UNSC Security Council at HIGHCOM Facility Bravo-6. The committee expresses misgivings of Lasky's handling of the Second Battle of Requiem and the failed assassination and escape of Dr. Halsey. Fleet Admiral Hood later tasks Infinity to escort him and the Arbiter on a diplomatic mission to Ealen IV.
 * Three ONI prowlers tasked to monitor the Shadow of Intent are destroyed. These losses are not reported to the UNSC Navy.
 * A Catalog unit receives a request of take control of the Forerunner ecumene made by an unknown entity bearing the Didact's sigil.

March 5
 * Battle of Ealen IV: Infinity arrives at Ealen IV. Lord Hood meets with Thel 'Vadam and the Jiralhanae Chieftain Lydus. While negotiating, the delegates come under attack from Covenant mercenaries working for a group of human insurgents, the New Colonial Alliance. The SPARTAN-IVs defend the ambassadors, who escape into a nearby parts depot.
 * Shipmaster Vata 'Gajat arrives on Ealen IV to personally oversee the attack, while the ambassadors escape through a series of tunnels leading to a fortified redoubt in which they could take refuge in. Captain Thomas Lasky orders Commander Palmer and the protection detail to escort the delegation to the redoubt, while he and Spartan Naiya Ray try to reestablish communications with the fleet above the planet.
 * As Fireteam Jackknife arrive at the redoubt, Vladimir Scruggs betrays his own team, killing them and the bodyguards. He then informs Commander Palmer it is safe to bring the delegates into the redoubt.
 * In orbit, the Sangheili and Jiralhanae ships begin to deploy forces against each other due to the ambiguity of the situation on the ground.
 * Lasky and Ray destroy the reactor generating the Covenant jamming signal, restoring communications.
 * After the ambassadors and their security detail arrive in the redoubt, Scruggs ambushes them and holds Hood at gunpoint. Palmer shoots Hood in the leg and, in the resulting confusion, confronts and kills Scruggs.
 * With the Covenant bearing on the site in force, the ambassadors escape to Infinity aboard a Covenant cargo tug. Paul DeMarco and Fireteam Bailey sacrifice themselves to cover the ambassadors' escape with Tyrant AA guns.
 * Infinity rallies the Sangheili and Jiralhanae fleets, prompting 'Gajat's fleet to retreat.
 * A funeral ceremony is held for the Spartans fallen in the battle, the practice of listing Spartans KIAs as MIA having been abolished.

March 8
 * Lasky and Hood discuss the likelihood of a severe security breach in the UNSC's organization, surmising that Scruggs could not have been the one who leaked the location of the negotiations.
 * Lasky and Hood discuss enlisting Petra Janecek's help in rooting out the spy who betrayed the Ealen IV delegation; the Fleet Admiral is uneasy with Lasky's decision due to a conflict between Hood and Janecek.
 * Lasky and Ray leave the Infinity in a prowler in order to recruit Janecek.

March 10
 * Lasky and Ray meet with Janecek in Castiglione on Escala III. Petra agrees to help Lasky uncover the UNSC spy in return for information regarding the Master Chief.

March 11
 * Infinity is ambushed on a mission to rescue a damaged civilian freighter, Pilgrims' Pride. However, they come under attack by automated craft supposedly originating from the long-lost.
 * Petra Janecek, Captain Lasky and Spartan Ray travel to the Sangheili colony of Karava to uncover the identity of the UNSC traitor. Meeting Janecek's informant Zef 'Trahl, they learn that the traitor is Daniel Clayton, a former UNSC captain and the illegitimate son of Spirit of Fire's commanding officer (and Hood's mentor), Captain James Cutter.
 * The UNSC supposedly discover the whereabouts of Spirit of Fire using data from Pilgrims' Pride. Infinity sets out to rescue the older ship. Upon arrival at the Spirit's supposed coordinates near Oth Lodon, however, they find a Covenant battlestation manned by the New Colonial Alliance. Having lured Infinity into a trap, Captain Daniel Clayton fires on the UNSC vessel with the station's energy projector, killing Commander Bradley and paralyzing Fleet Admiral Hood.
 * Clayton orders 'Gajat to stop the Spartans who are en route to the station, but 'Gajat decides to destroy Infinity instead. Fireteam Majestic and Commander Palmer board and secure the station, then destroy 'Gajat's corvette with the energy projector. Clayton is apprehended and transported to Infinity.

March 14
 * The UNSC dispatch a trio of vessels to Oth Lodon to assist with repairs to Infinity and to monitor the captured space station.
 * Lasky and Ray return to Infinity. The captain insists that the recent ambush could have been avoided if he were present, though Palmer insists that Lord Hood is to blame.
 * Hood visits Clayton and asks him why Admiral Mattius Drake wanted to destroy Infinity despite his attempt to capture it five years prior. Clayton tells Hood the New Colonial Alliance is stronger than before and have agents on every colony, as well as Earth. Hood orders Clayton's incarceration at ONI's Midnight Facility, but Clayton insists that they will meet again and the UNSC will fall.
 * In an unknown system, Spirit of Fire drifts near a terrestrial planet. Inside, the ship is put on alert while a Flood infection form crawls across one of the ship's cryo bays.

March 22
 * After having a nightmare about the New Phoenix Incident, Gabriel Thorne discusses it with Tedra Grant. Grant suggest Thorne the possibility of returning to New Phoenix for its reopening to see if his nightmares stop appearing after a visit to the city. After Grant's insistence, Thorne accepts.

March 24
 * Eight months after the attack on New Phoenix, the city is lifted from its quarantine. The President of the UEG, Dr. Ruth Charet, presides over the reopening of the city.
 * Returning to New Phoenix, Spartan Thorne, accompanied by Grant, receives proper closure about his grandmother's death in the New Phoenix Incident.

Around March 29
 * The Autumn-class cruiser is commissioned.
 * War photographer and journalist Benjamin Giraud is hired by ONI's Senior Communications Director Michael Sullivan to write an in-depth profile on the Master Chief. After a time, Giraud starts to sense something is off and began finding hints of coverups, then resolves to establish the truth and perhaps discredit the dark rumors associated with John-117.
 * Human-Sangheili peace talks on Biko are violently disrupted by Sapien Sunrise, a reactionary anti-alien movement. John-117 arrives to stop the terrorists, killing nineteen bodyguards, nine of whom are confirmed Sapien Sunrise members. The Spartan escorts Outer Colonies ambassador Richard Sekibo and all but three of the alien diplomats off-world, though Sekibo soon dies from his injuries. The event is covered up by the UEG to make the Master Chief seem responsible for the attack, however the Chief is soon vindicated.

April
April 15-April 17
 * Roughly a month after the events at Oth Lodon, the Infinity is fully repaired.

May
May 8
 * A UNSC spy drone investigates a Covenant bioweapon research laboratory on Ven III.

May 9-May 10
 * Spartans Ray and Thorne are assigned to a secret mission to capture a Sangheili in possession of the bioweapon unleashed on Ven III.
 * Thorne is captured and Ray discovers a major hideout for Kig-Yar pirates. Consequently, Captain Lasky decides to intervene and has Infinity head for Ven III.
 * Arriving at Ven III, Infinity is met by the Kig-Yar pirate queen's fleet and an orbital engagement ensues.
 * One of Infinity ' s Longswords destroys the pirate hideout with two HAVOK missiles.
 * Ray pursues the Sangheili agent and disables his Ghost outside the base. Before she can take any further action, a prowler lands nearby and ONI agents lead the Sangheili inside under Admiral Osman's orders.
 * Thorne is rescued by Fireteam Majestic and Palmer, and returns to the Infinity.

Unknown date
 * Lasky and Palmer speculate that ONI intentionally had Infinity get involved in the mission so the Kig-Yar pirates would be eliminated, after HIGHCOM failed to get involved six months ago. They conclude that the incident with the bioweapon was set up by ONI and the Sangheili agent was working for them.

July
July 15
 * Dr. Catherine Halsey makes a personal journal entry on her views on the Forerunners and their technology, her contribution to humanity's survival and subsequent condemnation by the UNSC, as well as her encounter with the Librarian on Requiem. Despite the UNSC turning against her, she remains determined to combine the halves of the Janus Key and take them to the Absolute Record to fulfill the Librarian's plan.

July 16
 * Oban is attacked by Jul 'Mdama's Covenant and his Promethean allies. Spartans and UNSC Marines successfully defeat 'Mdama's forces in Saviron.

July 17
 * Captain Lasky and Commander Palmer discuss Jul's assault on Oban. Lasky points out Palmer's frustration to find Dr. Halsey and reveals he wants Halsey back in custody. Palmer objects to having Halsey brought back and expresses her to desire to eliminate Halsey instead.

July 18
 * Dr. Halsey and Jul 'Mdama use a Forerunner artifact to trap UNSC Infinity in an uncharted system, preventing the ship from making slipspace jumps. Halsey intends to force the UNSC to give her their half of the Janus Key by luring them on a local planet using an energy source emanating from the surface. Aboard Infinity, Commander Palmer decides to lead a Spartan team to investigate the source of the signal on the planet.

July 19
 * The crew of UNSC Infinity track the source of interference to an island on Aktis IV. Commander Palmer and Fireteam Majestic eliminate a small Covenant force protecting a Forerunner structure on the island.
 * Upon discovering an artifact within the structure that is seemingly compatible with the Janus Key, the UNSC half of the Key is brought down to the island. Having created the artifact to fool the UNSC at the suggestion of Halsey, Jul 'Mdama's forces prepare to ambush the UNSC aircraft carrying the Janus Key to take it for themselves.
 * A rogue splinter group of 'Mdama's Covenant shoots down the UNSC aircraft and takes the Janus Key half for themselves, with its leader, Sali 'Nyon, inciting a rebellion amongst 'Mdama's forces.
 * Jul 'Mdama's concealed fleet emerges from Aktis IV's foam ocean and engages Infinity and the UNSC ground forces. The Spartans and Dr. Glassman barricade themselves into the Forerunner structure.

July 20
 * After seven hours of conflict, Infinity remains engaged by 'Mdama's fleet over Aktis IV.
 * The Spartans and Dr. Glassman use the local teleportation grid to escape the besieged Forerunner structure. Palmer, Ray and Thorne take a portal to the jungle, intending to locate Halsey, while Grant leads the rest of Fireteam Majestic and Dr. Glassman to the other end of the island where UNSC reinforcements have been deployed.
 * With Sali 'Nyon's rebellion ongoing in the Covenant's ranks, one Sangheili of 'Nyon's faction becomes disillusioned with the rebellion, steals 'Nyon's half of the Janus Key, and offers it to 'Mdama's forces. Dr. Halsey personally travels to the planet to claim the Key.
 * Commander Palmer's team observe the Sangheili defector in the jungle and wait for Dr. Halsey to arrive in order to ambush her. A firefight subsequently ensues between the Spartans and Halsey's Sangheili escort.
 * Sali 'Nyon's rebellion is stopped by Jul 'Mdama and his forces, with 'Nyon captured and all his followers killed.
 * Palmer captures Dr. Halsey, but the doctor clouds Palmer's judgment momentarily and escapes. Palmer gives chase, only to be incapacitated by a Harvester. Halsey contacts Jul 'Mdama and is picked up by a Phantom.

July 23
 * Aboard Infinity, Lasky converses with Palmer concerning the events on Aktis IV while two ONI agents demand an audience with her. Palmer informs Lasky that because of her failure, Halsey and 'Mdama are now in possession of both halves of the Janus Key.
 * Jul 'Mdama and Dr. Halsey recombine the halves of the Janus Key, pinpoint the location of the Absolute Record, and set course there.

September
September 15
 * Admiral Serin Osman briefs ONI officers about Operation: ATHENA. A five-man team consisting of Spartan Palmer, Spartan Thorne, Spartan Tanaka, Ayit 'Sevi, and Dr. Glassman is assembled to infiltrate Jul 'Mdama's fleet and relay the location of the Absolute Record for UNSC reinforcements.

September 17
 * The team stows away aboard the Breath of Annihilation just before Jul's fleet makes the jump toward the Absolute Record.
 * Jul's fleet exits slipstream space near a gas giant. While reaching their destination, multiple slipspace portals appear and damage several ships of the fleet, including Breath of Annihilation.

Unknown date

 * Blue Team is deployed on a mission in the abandoned ONI research vessel . Some time after this mission, the Spartan-IIs fall out of contact with the UNSC and are declared AWOL. A Spartan-IV team led by Jameson Locke is subsequently dispatched to track them down.
 * Forerunner activities on five human colonies lead to massive destruction. ONI agent Maya Sankar is reassigned to Conrad's Point, one of the five colonies, under the cover of "FERO" (her alter ego as an Insurrectionist demagogue) to infiltrate and investigate the NCA-controlled colony.
 * Fireteam Osiris is deployed to Kamchatka to rescue Dr. Halsey after the latter contacts UNSC and claims to have information regarding the Forerunner attacks.

October
October 27
 * During the search for Blue Team, Fireteam Osiris is deployed to Sanghelios to assist Arbiter Thel 'Vadam in his battle against Jul 'Mdama's Covenant faction.

Unknown date

 * Followers of the Triad spread their beliefs around on social media sites.