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- "You are Spartans now. You stand side by side with your Spartan brothers and sisters. You march into battle together--you do not charge ahead. You do not grab glory for yourself. Spartans don't have rank because Spartan is your rank. You are naturally superior. We have made you better. You are Spartans now. Start acting like it."
The SPARTAN-IV program is the fourth iteration of the SPARTAN supersoldier projects. Like the original ORION Project, the SPARTAN-IV program utilizes consenting adult volunteers selected from the other branches of the United Nations Space Command, in contrast to the previous two programs which used children as candidates. Recruits are drawn from both career military veterans and young soldiers who show considerable promise. The physical augmentations of the SPARTAN-IV supersoldiers are more modest than those of the two preceding programs, although their standard-issue GEN2 MJOLNIR armor is designed to compensate for this drawback. The SPARTAN-IVs serve in the independent Spartan branch, which was created for the oversight of their operations.
At some point prior to the instatement of the current SPARTAN-IV program, elements within the Office of Naval Intelligence's Section III authorized a prototypical phase without approval from High Command. This incarnation was intended to produce supersoldiers whose physical prowess rendered MJOLNIR armor redundant. However, only one of the ten volunteer test subjects survived the augmentation process. The survivor, Ilsa Zane, was driven mad by the experience and was folded into ONI. Despite the project's failure, Zane was considered the original SPARTAN-IV.
The program as it now exists was commissioned as a result of the success of the preceding SPARTAN-II and SPARTAN-III projects. The SPARTAN-IV project was conceived by Lieutenant Commander Musa-096, a former SPARTAN-II candidate who was crippled by the augmentation process. Despite his grudge toward Dr. Catherine Halsey, Musa recognized the crucial role of the Spartans in defending humanity and the continued importance of the supersoldiers in the aftermath of the Human-Covenant War. The proposal was approved by Admiral Margaret Parangosky, then Commander-in-Chief of the Office of Naval Intelligence, and the new program was initiated under her orders. Parangosky initially planned to have SPARTAN-III lead Colonel James Ackerson heading the program, with SPARTAN-II project lead Dr. Catherine Halsey to be reassigned as Ackerson's subordinate. Ackerson was killed following the Battle of Mare Erythraeum and Halsey was arrested after returning from Onyx, though ONI continued the program without the two, with the help of Musa and Jun-A266, a former SPARTAN-III Alpha Company member.
In addition to the significant numbers of adult volunteers which make up the majority of the SPARTAN-IVs, the SPARTAN-IIs and SPARTAN-IIIs who survived the Human-Covenant War were offered to be integrated into the SPARTAN-IV program. The first class of SPARTAN-IVs went active in early 2553. Hundreds of SPARTAN-IVs are assigned to the UNSC Infinity, the most powerful warship ever constructed by mankind. They train with one another in simulations known as "War Games" on the Infinity's state-of-the art combat deck (a training chamber that is capable of replicating environments), in order to constantly stay battle-ready.
The SPARTAN-IVs serve in a dedicated branch of the UNSC known simply as "Spartan", whereas their forebears operated within other chains of command. Unlike their predecessors, the SPARTAN-IVs are identified by their surnames rather than numeric tags (due to their volunteered enlistment rather than kidnapping/conscription). Unusually, the SPARTAN-IVs have shown a great deal of solidarity, especially impressive given the short time they have served together. Many of them have adopted colloquialisms first used by the SPARTAN-IIs, such as "Alpha Bravo" for "Alien Bastard". Psychologists assert that this camaraderie and cohesiveness will help distinguish the SPARTAN-IVs, and the Spartan branch as a whole, from the other UNSC branches.
List of SPARTAN-IV units and personnel
|UNSC Infinity Spartan command||Active|
|Gypsy Company||Active||At least two Spartan-IVs||Also contains UNSC Marine Corps personnel.|
|Mountain Squad||KIA||A science attache unit. Killed during the Requiem campaign after being shot down in Two Giants.|
|Fireteam Apex||Active||unknown||Participated in the Requiem campaign|
|Fireteam Avalanche||Active||unknown||Participated in the Requiem campaign|
|Fireteam Bailey||KIA||Killed in action during the Battle of Ealen IV|
|Fireteam Castle||KIA||Killed in action after being shot down during the Requiem campaign|
|Fireteam Crimson||Active||Four Spartan-IVs||Participated in the Requiem campaign|
|Fireteam Colossus||Active||unknown||Participated in the initial ambush in the Raid on Oth Lodon|
|Fireteam Domino||Active||unknown||Participated in the Requiem campaign|
|Fireteam Fenrir||Active||unknown||Participated in the initial ambush in the Raid on Oth Lodon|
|Fireteam Forest||Active||Aided Crimson in acquiring replace power supply for the Harvester|
|Fireteam Horse||Active||unknown||Participated in the Requiem campaign|
|Fireteam Ivy||Active||unknown||Participated in the Requiem campaign|
|Fireteam Jackknife||Disbanded||Participated in the Battle of Ealen IV; betrayed by Vladimir Scruggs|
|Fireteam Kodiak||Active||unknown||Participated in the Requiem campaign|
|Fireteam Lancer||Active||Participated in the Requiem campaign|
|Fireteam Majestic||Active||Participated in the Requiem campaign and the Raid on Oth Lodon|
|Fireteam Rhino||Active||unknown||Participated in the Requiem campaign|
|Fireteam Shadow||Active||Participated in the Requiem campaign|
|Fireteam Sword||Active||unknown||Participated in the Requiem campaign|
|Fireteam Switchback||Active||Captured during a mission to destroy a Harvester during the Requiem campaign Later rescued by Fireteam Crimson and Fireteam Lancer.|
|Fireteam Sydney||Active||unknown||Participated in the Requiem campaign|
|Fireteam Talon||Active||unknown||Participated in the Requiem campaign|
|Fireteam Tower||Active||unknown||Participated in the Requiem campaign|
|Fireteam Wolf||Active||unknown||Participated in the Requiem campaign|
- Bethany Kossup
- Edward Davis - KIA during the Battle of Draetheus V
- Jameson Locke 
- Joel Thomas
- Yeong-hao Holst
- Several Spartans killed by Gek 'Lhar
Ten SPARTAN-IV candidates were discharged from the prototypical phase of the program after being crippled or killed by the augmentations.
- Ilsa Zane - Discharged after her augmentations left her mentally unstable. Assigned to the Office of Naval Intelligence, but subsequently escaped and defected to the Insurrection.
- Main article: MJOLNIR Powered Assault Armor (GEN2)
SPARTAN-IVs are equipped with the MJOLNIR [GEN2], the second-generation version of the MJOLNIR Powered Assault Armor. Because of the SPARTAN-IVs' inferior biological augmentation, the GEN2 armor boosts its wearer's reactions and strength to a far greater degree than the first-generation MJOLNIR.
An assortment of armor configurations are available for all new Spartans per UNSC Regulation 3A-950, and Spartans are capable of customizing their individual armor set with modular components from a wide range of special-purpose variants, based on their personal preferences, specialization and mission requirements. Selecting variants for purely cosmetic reasons is discouraged. It is strictly forbidden for Spartans to attempt to repair or modify their armor; all armor maintenance is only to be performed by qualified Class-61 technicians in dedicated facilities. Unlike the uniformly green coloration of the SPARTAN-IIs' first-generation MJOLNIR armor, SPARTAN-IV armor comes in a profusion of distinct color patterns, with the members of specific teams often sporting a consistent coloration. However, any customization of the armor color must be in accordance to UNSC Equipment Code 20.00.62.
- Main article: SPARTAN-IV Augmentation Program
Like the augmentations performed for the SPARTAN-IIs and the improved procedures utilized in the subsequent SPARTAN-III program, the SPARTAN-IVs underwent a series of procedures to enhance their physical capabilities and to wear MJOLNIR armor. The technology used in the two preceding SPARTAN programs necessitated that the candidates meet exceedingly strict genetic qualifications as well as the application of the enhancements on preteens, to avoid the catastrophic failure rates produced by the augmentation of adult subjects in the ORION Project. By the time of the initiation of the SPARTAN-IV program, the technology had advanced to the point that adults could be augmented without major risk, although the procedures are not as extensive as those performed on their second and third-generation forebears.
A SPARTAN-IV from Making Halo 4: First Look.
List of appearances
- Halo: Glasslands (First mentioned)
- Halo: The Thursday War (Mentioned only)
- Halo 4 (First appearance)
- Halo: Spartan Assault
- Halo: Initiation
- Halo: Escalation
- Halo: The Master Chief Collection
- Halo 5: Guardians
- ^ a b YouTube: Halo 4 Flag Stabbing and Spartan Cosplay - Comic-Con 2012
- ^ Halo: Initiation, issue 2
- ^ Halo: Glasslands, page 434
- ^ a b Eleventh Hour reports, part 3
- ^ a b c Frank O'Connor interview during San Diego Comic-Con 2012 1:15 - 2:10
- ^ a b c Halo 4 Official Site: Story
- ^ Halo: Escalation
- ^ a b c Halo: Initiation, Issue 1
- ^ Halo: Glasslands, page 147
- ^ a b Halo: Glasslands, page 422
- ^ Halo: Glasslands, page 435
- ^ a b Gameinformer (May 2012), pages 46-47
- ^ a b YouTube - Halo 4: Spartan Ops Gameplay
- ^ a b Halo 4, level Reclaimer
- ^ a b c d Spartan Ops, S1E3 Spartan Mountain
- ^ a b c d e f g h i j k l m n o p q r s Halo 4 Limited Edition — War Games Session Summary
- ^ Spartan Ops, Episode 7, Chapter 2: "Home Field"
- ^ Spartan Ops, S1E1 Departure
- ^ Spartan Ops, S1E4 Didact's Hand: Chapter 1: Hairy Call
- ^ Spartan Ops, Episode 10, Chapter 3: "Seize the Power"
- ^ Spartan Ops, Episode 7, Chapter 4: "The Guns of Infinity"
- ^ MightyApe.co.nz: Halo 4 Limited Edition screenshots
- ^ YouTube - Halo 4: Spartan Ops - Episode 6 Chapter 4 Developer Commentary
- ^ Spartan Ops, S1E8 Expendable: Chapter 3: Lancer
- ^ a b Halo: Initiation, Issue 3
- ^ a b Halo 4 Limited Edition - Infinity Briefing Packet
- ^ a b Spartan Ops
- ^ Halo 4, Recruit armor description
- ^ Halo 4 campaign level Infinity
- ^ Dr. Halsey's personal journal
- ^ Halo: Initiation, Issue #2