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MJOLNIR Powered Assault Armor/Mark IV

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H5G Render-Armor MarkIV
“You're the only ones who can use them, Petty Officer. Who else could we give them to?”

The Mark IV MJOLNIR Powered Assault Armor was the fourth of seven versions of the MJOLNIR powered assault armor. The suit was issued to SPARTAN-II commandos on November 27th, 2525,[1] and was in service until November 24th, 2551, when it was replaced by the Mark V. John-117 was known to use the Mark IV until an unspecified later date due to him being in the field when the Mark V originally entered service.[2]


Created alongside the SPARTAN-II Program,[3] the MJOLNIR Mark IV Armor was a radical redesign to previous powered exoskeletons, streamlining their design into a practical purpose for use in the field. The brainchild of Dr. Catherine Halsey, the Mark IV represented her vision of creating a powered exoskeleton capable of taking full advantage of the physical capabilities of a SPARTAN-II.[3] The MJOLNIR battlesuit is constructed in overlapping layers. It is a sealed system, capable of extravehicular activity or operations in toxic atmosphere and vacuum. It is hardened against EMP and radiation, and has filters that are completely effective at removing toxins and bacteria from local atmosphere.[4][note 1][5]

The armor's shell is composed of a multilayer alloy of remarkable strength which has been augmented with a refractive coating capable of dispersing a limited amount of Covenant energy weapon strikes.[4][6] The suit contains a gel-filled layer underneath a thick black armored bodysuit. The gel layer regulates temperature and can reactively change its density in a few seconds.[4][6] The inner skinsuit is made of a moisture-absorbing synthetic material linked to an environmental control computer and the occupant's SPARTAN-issue Command Neural Interface.[4][6] An upgrade to the standard Neural Interface is issued to all high-ranking officers; another modified version of the neural lace is issued to all SPARTAN-IIs in the UNSC as well. This network translates electrochemical signals to digital code and routes them through an interface connection at the rear of the skull.[4] Through this interface, the user's thoughts command the armor's movement and weapons and input from the onboard sensors comes directly to the user's mind.[4] The synthesis of machine and mind is so fast that it is almost impossible to chart the reaction time. Unfortunately, the system is so reactive that normal human beings cannot use the suit without injuring or even killing themselves.[7] Only humans who have undergone carbide ceramic ossification, a bone-strengthening treatment from the SPARTAN-II augmentation program, have been shown to safely operate the suit.

Sandwiched between the external armor and the internal padding is the most devastating weapon the suit carries: a layer of reactive metal liquid crystal.[4] Woven by molecular tools into a superdense layer, this layer is amorphous, yet it amplifies force, doubling lifting capability and increasing reaction time by a factor of five.[3] Such technology did not exist when work began on the Mark I prototypes.[3][8]

Because of these advancements, the design is more akin to an actual suit of armor, as opposed to a powered exoskeleton; the user moves the suit, and in return the suit moves the user. This allows for an incredibly compact design when compared to other combat systems. The armor contains numerous features including an integrated computer system which continuously monitors weapons, biological functions, and a "smart" motion-sensing radar. The suit also contains a built-in oxygen re-breather system that can provide air for up to ninety minutes.[5] The suit's helmet also features imaging and video recording, and thermal sensors among other features.

In its final phase the MJOLNIR battle suit weighs nearly half of a metric ton,[9] or 1000 lbs, and when in use, is a fully neural-linked system and was the most advanced piece of tactical military hardware in human hands at the time of its inception.[4]

Armor VariantsEdit

Throughout the Human-Covenant War, the Mark IV became a testing bed for new technologies and hardware to help improve the integrity of both the system and the efficiency of it in certain combat conditions. While some of these variants of the Mark IV MJOLNIR armor are rumors and have never been witnessed in the field, some have become common knowledge.[10]

Mark IV MJOLNIR Powered Assault Armor/Advanced Hardware PrototypeEdit

The MJOLNIR advanced hardware prototype refers to a series of hardware and technologies developed for testing and incorporation into later versions of the MJOLNIR Armor. The advanced prototype is a single variant, that changes in appearance for research and development of future MJOLNIR components.[10]

Mark IV MJOLNIR Powered Assault Armor/V variantEdit

Main article: MJOLNIR Powered Assault Armor/V variant

The MJOLNIR Mark IV Extra Vehicular Activity variant was developed to focus on increasing exo-atmospheric endurance and improving mobility in zero gravity. The movement could be controlled with the use of a T-PACK, or Thruster Pack, attached to the armor. This was not without dangers however; in case the T-PACK would malfunction, the wearer would be propelled into deep space where a rescue would be nearly impossible. The V variant of the MJOLNIR armor contains a reverse-angle camera on the helmet to allow for better view of anything behind the wearer. The helmet also contains a single-beam laser TEAMCOM system for communications. The only limitation of this variant is the mobility of the wearer is a fraction of normal movement.[11] Technologies developed for the Mark IV EVA variant were later applied for the V Variant of the Mark VI armor. However, this version was able to maneuver in vacuum without the original use of thruster packs.

Mark IV MJOLNIR Powered Assault Armor/Grenadier VariantEdit

Main article: MJOLNIR Powered Assault Armor/Mark IV(G)

The Mark IV [G] variant is an up-armored prototype based on the standard Mark IV helmet. It served as the basis for all subsequent armor variant development programs, and is also compatible with later models such as the Mark V. Additionally, the variant served as the test bed for incorporating energy shielding technology with the MJOLNIR.

Armor ComponentsEdit

  • Helmet: The MJOLNIR Helmet is one of the most vital aspects to the MJOLNIR system. It is made of Titanium and contains key features like a Heads-up display that links to the brain and hands, and can identify equipment and display information about it when it is picked up by the wearer. Another feature is the direct neural interface system which connects to a SPARTAN-IIs neural implants. Two core processor chips are implanted into the subjects skull in the rear of the head. This is essentially comparable to an on board computer using parts of the human brain for processing - when the connector at the rear of the subjects head and receptors in the brain link to the helmets on board sensors it creates the neural link needed to move the MJOLNIR suit. The helmet also contains other equipment to protect and aid the user in hostile conditions. This includes: filters to remove toxins from the atmosphere, a supply to provide air to the wearer during EVA, thermal and motion sensors, communications, solar-powered lighting, and imaging and video gear.
  • Titanium Alloy Outer Shell: The outer shell of the MJOLNIR armor is comprised of a fairly thick titanium alloy. This plating covers the chest, arms, hip, legs, calf's, feet and hands. This alloy is very resilient, can take significant punishment, and is nearly impervious to small arms fire. While enough shots from armor piercing rounds will breach the outer shell, the suit can take a few glancing blows from them without compromising the armor. The outer shell of the MJOLNIR suit is covered with a refractive coating to help disperse the heat experienced from Covenant energy weapons. However one or two direct hits from any Plasma weapon will compromise the armor plating.[12]
  • Titanium Nanocomposite Bodysuit: Sandwiched between the external armor and the internal padding is a thick black armored bodysuit. This suit has numerous functions, small but vital to the safety and survival of the wearer. The bodysuit is made of a titanium-based material, making it very strong and yet very flexible. It also serves as another layer of protection against ballistics attacks and is coated with a heat resistant material to disperse heat from plasma weapons.[12]
  • Hydrostatic Gel: Underneath the armored bodysuit is a gel-filled layer, this gel layer regulates the temperature of the suit and can change its density to conform to the wearer's shape - the temperature inside the suit is controlled by the moisture absorbing cloth suit underneath the hydrostatic layer. The hydrostatic gel layer can also be pressurized to various levels to potentially save the wearers life should the wearer be subjected to high G forces or a high velocity impact; however, over pressurizing this layer can cause nitrogen embolisms.[13][14]
  • Reactive Metal Liquid Crystal Layer: Liquid crystal forms the inner structure of the suit. This reactive metal increases the strength, reaction time, mobility, speed, and all around physical performance of the SPARTAN-II. This layer of crystal, knitted together at a molecular level and fitted in between the outer plates and the inner padding, accounts for over eighty percent of the MJOLNIR armors cost of construction and materials.[10]
  • Magnetic Weapon Holder Strips:Available on the Mk. IV, Mk. V, and Mk. VI, the magnetic strips are very small yet powerful magnets placed on the legs, waist, and back of the suit and is used to hold any equipment with a magnetic property. The suit also contains a magnet system on the boots of the MJOLNIR suit that allow its wearer to stay attached to a metal surface in Zero G environments and can be toggled on or off by the wearer.
  • Pressure Seal: The Pressure Seal is a vital component to the MJOLNIR system, it keeps the system airtight, underwater or in space. The seal is very strong but will only break under extreme pressure, such as in a high velocity impact or when the Hydrostatic Gel has been over pressurized.
  • Biofoam Injector Port: The biofoam injectors on the Mark IV is a port where a direct supply of biofoam or other medicines, must be administered from a standard military first aid kit when the wearer is injured, as the suit does not hold or generate its own supply inside the suit.
  • Fusion Reactor: The fusion reactor is the most essential part of the MJOLNIR System, as it provides power to all equipment on the MJOLNIR armor, the reactor is built into the suit and allows for nearly unlimited movement. The fusion reactor in all versions of the MJOLNIR armor are half the size of a normal fusion pack that conventional marines carry around.[15]


The visual appearance of the MJOLNIR Mark IV has changed considerably every time it has appeared in fiction. This has led to confusion of whether these are separate variants or if the differences are simply aesthetic in nature.[note 2] Frank O'Connor stated in an email that the Cole Protocol and Halo Wars versions of the Mark IV are "both simple correct variations of the same model." [16] In Halo 4: The Essential Visual Guide it is said that John's armor after being modified resembles the MJOLNIR Mark IV.

Halo: The Cole ProtocolEdit

CP armor


The Cole Protocol cover design of the Mark IV depicts it as a very rough, yet familiar in recognition to later incarnations of the MJOLNIR armor. Its chest plate is more angular than that of the other versions, somewhat reminiscent of the Mark V. The helmet of the Mark IV shows hints in design to both the Mark V and Mark VI helmet. The shoulder pauldrons consist of a semi-circular plate of metal to allow more freedom of movement in the shoulder area. The back shoulder plates also appear to be removable to attach additional equipment.

Halo Wars/Legends/The Fall of Reach (2010 reprint)Edit

Template small


This version is introduced in Halo Wars, and has appeared in several titles produced by 343 Industries, including the Halo Legends episodes The Babysitter and Origins, as well as the 2010 cover of Halo: The Fall of Reach. In this version, the armor plating for the body, arms and legs are more akin to the Mark VI, with a bulky, angular chest plate and large, bulbous shoulder pauldrons. The helmet in terms of design is almost exactly like the Mark V's, and both Dr. Halsey's personal journal and the Halo: Reach Armory clarify that they are the same helmets, adapted for use on the later armor model.[17][18] The armor also appears to contain magnetic holders for magazines and weapons.[note 3]

The PackageEdit

John Mark IV

Package MK IV.

In The Package, the Mark IV armor is visually similar to the Mark VI, with some differences in the proportions and the details, such as thicker and more angular armor plating. There are differences in the helmets as well. Each SPARTAN's service number is also printed on the chest plate of the armor along with other markings such as white stripes on the chest and pauldrons. This, like all versions, also appears to have magnetic holsters for weapons but also sports compatibility for a combat knife sheath within the pauldrons.[note 4]



Homecoming MK IV.

The Mark IV worn by Daisy-023 in Homecoming resembles the MJOLNIR/C variant, but is otherwise largely unrelated to it.[note 5] The appearance of the armor is a stylistic and aesthetic nod towards multiplayer fans who use different colors in various environments and the various armor permutations, as well as an aesthetic concession to the anime studio as a means of possessing visual variety.[19]


  • A Spartan III was reminded of the Green Knight when he first saw Kurt Ambrose in the MJOLNIR Mark IV powered assault armor.



  1. The reference, Master Chief's Armor: An Overview is an article that was posted on before the release of Halo: Combat Evolved. It is an official excerpt from the Halo Story Team, however as of recent the article has been removed from there is only a few websites that have re-posted the article, including the old halo timeline that article can be viewed here.
  2. This section is here in part to bring together a difference of opinions pertaining to the design of the MJOLNIR Mark IV, using what information is available and combining them into a single as factual as can be entry. No official source has defined if the Halo Wars or Cole Protocol version is the standard variant. Please refer to the talk page for questions or issues.
  3. Halo Wars portrays the Mark IV with energy shields. This is a liberty taken by the developers for the sake of gameplay, as stated here.
  4. In Halo: Legends most of the designs for characters, armor and so forth are portrayed with considerable artistic interpretation and may or may not be embraced as canon. For example, The Fall of Reach and Ghosts of Onyx states that the MJOLNIR Armor was not designed to bear rank insignia. The reason the SPARTAN-IIs' service tags appear on the chest plate in The Package is essentially to inform the viewer who is who. Halo Wars and The Babysitter show the Spartans with personalized insignias painted on their armor; this is also an artistic liberty, partially explained in an interview with Graeme Devine, the lead designer of Halo Wars.
  5. The armor description for the CQC variant in Halo: Reach Multiplayer Beta states that the CQC variant, the precursor for the C variant, entered service in 2548, thus making it impossible for the C variant to have been in use around twenty years earlier. In addition, the C variant was developed using feedback from the Battle of Jericho VII, which occurred years after the Harvest Campaign. The direct's commentary for the episode reveals that the armor's appearance is largely an aesthetic concession to the studio to allow for some visual variety for the character, and as a nod towards multiplayer fans who use armor permutations, such as the CQC variant. The same is true for the armor's color, though this is also representative of an effort to camouflage the suit. This means that other than the suit's color, the armor's appearance is non-canon.


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