Editing MJOLNIR Powered Assault Armor

{{Status|Canon}}

The '''MJOLNIR Powered Assault Armor System'''<ref>[http://www.halowaypoint.com/en-us/intel/armor ''Halo Waypoint -Halo 4 Armor'']</ref> (pronunciation:''ˈmjɔːlnɪər'', ''myol-neer'') is a technologically advanced [[Powered exoskeleton|combat exoskeleton system]] designed to vastly improve the strength, speed, agility, reflexes, and durability of a [[SPARTAN Program|Spartan]] supersoldier. Though the development program is rendered in all capital letters (''i.e.'' Project: MJOLNIR), the armor itself is called '''Mjolnir'''.<ref>''Halo 4: The Essential Visual Guide'', page 229</ref> The suit is named after the [[Wikipedia:Mjölnir|hammer of Thor]] in Norse mythology.

Created parallel to the [[SPARTAN-II program]] by the [[Office of Naval Intelligence]]'s [[Materials Group]], the Mjolnir armor is the most advanced piece of tactical military hardware in human hands. Each suit alone costs as much as a small starship. The brainchild of [[Catherine Halsey|Dr. Catherine Halsey]], MJOLNIR is an attempt to create a powered exoskeleton capable of taking full advantage of the physical capabilities of a Spartan.<ref name="sybex">'''Halo: Combat Evolved PC Strategy Guide''', ''page 5''</ref> MJOLNIR is considered by the [[Librarian]] to be the fulfillment of a millennia-old [[geas]] she had implanted in humanity a hundred millenia earlier, intended to help them [[Reclaimer|reclaim]] the [[Mantle]].<ref>'''Halo 4''', campaign level ''[[Reclaimer (level)|Reclaimer]]''</ref>

Spanning over three decades of development, Project MJOLNIR encompassed more than just a suit of armor, but as a pioneering effort intended to shatter current technological barriers. In its final iteration, Mjolnir is a highly advanced suit capable of further enhancing the Spartans' physical performance while also doubling as a platform capable of handling an artificial intelligence network.<ref name="ENCY">'''[[Halo Encyclopedia (2009 edition)]]''', ''page 88''</ref>

Unlike the powered exoskeletons that preceded it, the Mjolnir battlesuit was designed from the ground up as a suit of armor; its design philosophy would serve as a basis for all future powered and semi-powered armor system designs.{{Ref/Reuse|ENCY}} Each generation of the Mjolnir battlesuit is composed of major fundamental components; construction of the suit is done in overlapping layers and has been remarked of it being akin to a giant three-dimensional puzzle.<ref>'''[[Halo: The Fall of Reach]]''' ''page 116'' (2001 edition), ''page 133'' (definitive edition) ''page 138'' (2010 edition)</ref> The armor's shell is composed of a multilayer alloy of remarkable strength and has been augmented with a refractive coating capable of dispersing a limited amount of Covenant [[Directed energy weapon|energy weapon]] strikes.<ref name="xbox">''Xbox.com'': The Master Chief's Armor: An Overview (defunct, [[Archive:Xbox.com/Halo/Armor|Archived]])</ref><ref name="FoR1">'''Halo: The Fall of Reach''', ''page 114-115'' (2001 edition) ''page 131'' (definitive edition) ''page 137'' (2010 edition)</ref> The suit contains a gel-filled layer underneath a thick black armored bodysuit. The gel layer regulates temperature and can reactively change its density. The inner skinsuit is made of a moisture-absorbing synthetic material linked to an environment control computer and the occupant's UNSC-issue [[neural interface]].{{Ref/Reuse|xbox}}{{Ref/Reuse|FoR1}}

The battlesuit is a sealed system, capable of [[extra-vehicular activity]] for a limited amount of time or operations in toxic atmosphere.{{Ref/Reuse|xbox}} It is hardened against [[Electromagnetic pulse|EMP]] and [[radiation]], and has filters that are completely effective at removing toxins and bacteria from local atmosphere.{{Ref/Reuse|xbox}} Between the external armor and the internal padding is the most devastating weapon the suit carries: a layer of [[polymerized lithium niobocene]], a liquid metal crystal that deforms along a preferred axis when exposed to an electric charge.{{Ref/Reuse|xbox}}<ref name="journalsep">'''[[Dr. Halsey's personal journal]]''' ''September 1, 2525''</ref> Woven by molecular tools into a capillary system, this layer is amorphous, yet amplifies force, doubling lifting capability and increasing reaction time by a factor of five. Because the Mjolnir system is so reactive, it can only be worn by a physically augmented human; ordinary people are unable to use the suit without injuring themselves.{{Ref/Reuse|xbox}}<ref name="FoR2">'''Halo: The Fall of Reach''', ''page 115'' (2001 edition) ''page 132'' (definitive edition) ''page 137'' (2010 edition)</ref><ref name="journal1">'''Dr. Halsey's personal journal''' ''June 30, 2525''</ref>

The Mjolnir battlesuit's greatest advantage, however, is a super-dense optical computer memory. This revolutionary solid-based crystalline layer forms a network within the suit's frame of proper size and capability of housing the types of artificial intelligence usually reserved for starships. Essentially a piggyback system, an AI can be delivered to the suit via a [[data crystal chip]] storage device no larger than a personal credit card. The AI's personality and processing matrices can be carried by the armor and in conjunction with the user, can neurally link with a being that has nearly unfettered control over mathematics, information and body control. Such technology did not exist when work began on the Mark I prototypes.{{Ref/Reuse|xbox}}<ref name="ENCY2">'''Halo Encyclopedia: The Definitive Guide to the Halo Universe''', ''page 89''</ref>

The functionality of the Mjolnir system is unprecedented. Rather than being a traditional suit of body armor, the Mjolnir battlesuit works on a biomechanical level, allowing for direct user-controlled movement. Each human being has a molecular fiber network called the nervous system within their brain. Upon induction, all military personnel are issued a [[neural interface]], which is implanted at the base of the [[skull]] and cannot be removed.{{Ref/Reuse|xbox}}<ref>'''Halo: The Fall of Reach''', ''page 118'', (2001 edition) ''page 135'', (definitive edition) ''page 140'' (2010 edition)</ref> Spartan-IIs received a [[SPARTAN neural interface|modified]] version of the neural lace specifically for the Mjolnir armor.{{Ref/Reuse|xbox}} This neural lace, which consists of two core processor chips which is linked to receptors in the subject's brain, which is connected to an interface connection at the rear of the skull;{{Ref/Reuse|ENCY}} reads the electrochemical signals sent from the brain and then translates these chemical signals into digital code.{{Ref/Reuse|xbox}} As the electrochemical impulse travels down the axon to the muscle, the digital code is routed through the interface connection, to the suit's on board sensors, the input from the sensors is then read by the onboard computer and then like the human body itself sends an electrical impulse through the suit, as the impulse from the motor neuron hits the muscle, the electrical impulse from the suit causes the polymerized lithium niobecene to deform along a preferred axis, overlapping each other more, so that the layer gets shorter and fatter.{{Ref/Reuse|journal1}}<ref name="journaljul">'''Dr. Halsey's personal journal''' ''July 30, 2511''</ref> When the impulses from the suit stop, the polygonal pieces slide back to their original positions. At the same time, as the muscle fibers are responding to the impulses, signals are sent to the suit that this is occurring, as the muscle twitches the force being applied to the suit is accelerated through force-multiplying circuits, which amplify the force of the muscular twitch by a positive feedback loop in the armor. The end result is a fully neurally linked machine, the user's thoughts move the suit and in return the suit moves the user. The synthesis of machine and mind is so fast that it is almost impossible to chart reaction time.{{Ref/Reuse|FoR2}}{{Ref/Reuse|ENCY2}}

In its final phase, the Mjolnir battlesuit weighs half a short ton, or 1,000 pounds,<ref>'''Halo: The Fall of Reach''', ''page 2'', (2001 edition) ''page 3'', (definitive edition) ''page 16'' (2010 edition)</ref> and is a fully neural-linked system. With an on board AI using the human mind for parallel processing, the Spartan/Mjolnir combination is designed to be the most devastating intelligence tool ever created.{{Ref/Reuse|sybex}}{{Ref/Reuse|xbox}}

Before Dr. Halsey initiated Project MJOLNIR, the [[UNSC Navy]] had developed various designs and prototypes for powered exoskeletons and armour systems, including the [[Mark I prototype exoskeleton|Mark I exoskeleton]],<ref name="FoR3">'''Halo: The Fall of Reach''', ''page 71'', (2001 edition) ''page 81'', (definitive edition) ''page 90'' (2010 edition)</ref> the [[Mark III exoskeleton]],{{Ref/Book|Id=EVGCyclops|EVG|Pg=44}} [[ORION armor]],{{Ref/Site|Id=CF|URL=https://www.halowaypoint.com/en-us/news/anniversary-armory|Site=Halo Waypoint|Page=Canon Fodder - Anniversary Armory|D=03|M=11|Y=2021}} and [[HRUNTING Mark I exoskeleton|HRUNTING Mark I]].{{Ref/Reuse|journal1}} In [[2510]], Halsey inspected much of this previous work while performing a program review of [[Project HRUNTING]] on behalf of ONI. She judged HRUNTING to be an "interesting failure" for its lack of innovation, and inability to exploit recent technological breakthroughs.{{Ref/Book|Id=Enc22p77|Enc22|Page=77}} Later, during the early stages of planning for Project: MJOLNIR, Halsey would ultimately choose to start from scratch, due to both the limitations inherent in the previous antiquated designs,{{Ref/Reuse|journal1}}{{Ref/Reuse|FoR3}} and an unwillingless to shoulder the administrative burden of taking over and reforming an existing project such as HRUNTING. Instead, Halsey preferred to start fresh with an entirely new team, who were unbound by pre-existing dogma and assumptions about powered exoskeleton design.{{Ref/Reuse|Enc22p77}}

The initial genesis of what would become Project: MJOLNIR can be traced back to as early as [[2511]]. By that year, Halsey was in communication with [[UNSC rank structure|Vice Admiral]] [[Michael Stanforth|Hieronymus Stanforth]] regarding the production of an armour system to complement the SPARTAN-II program, and had begun to brainstorm names for the project. In July, she penned an entry in her [[Dr. Halsey's personal journal|personal journal]] speculating that the [[Wikipedia:Piezoelectricity|reverse piezoelectric effect]] could be used to produce a bodysuit that enhanced the wearer's strength, by causing the suit to intelligently deform in response to the wearer's nerve impulses, adding extra force to their movements. This would become one of the defining features of MJOLNIR armour.{{Ref/Reuse|journal1}}

Work on Project: MJOLNIR would not begin in earnest for a further four years, however, with development beginning in [[2515]].{{Ref/Reuse|ENCY}} In that year, the project opened with a experimental phase, with a development platform that would be retroactively termed "Mark I" being used as a testbed for numerous trials and experiments over the following years.{{Ref/Reuse|Enc22p77}} The armour underwent significant iteration in the decade following, with at two further distinct prototype platforms emerging and forty prototype suits being produced across these three platforms, before the first production model - what would come to be known as Mark IV - was finalised. Mark IV was put into production in mid-[[2525]] and issued to the surviving SPARTAN-II candidates in November of that year.{{Ref/Reuse|FoR2}}{{Ref/Reuse|ENCY}}

Initially, MJOLNIR was envisaged as an evolving platform, constantly and continuously updated with the latest technology as it became available. After a full decade, however, the Office of Naval Intelligence decided that it was no longer possible to facilitate this approach, much to Halsey's chagrin. In [[2535]], they mandated that MJOLNIR adopt a generational categorisation system, for the purposes of serialisation, prioritisation and progress-tracking, and as a means of fiscal oversight. Despite her reservations, Halsey agreed to the introduction of such a system, and produced a roadmap for future generations of the armour, in the hopes that it would "keep the accountants out of [her] hair and [her] work". The system devoted Marks I, II and III to prototype platforms produced between 2515 and 2525, while categorising all production models of MJOLNIR up until that point as Mark IV. Three further planned iterations, Marks V, VI and VII, were included in the roadmap, complete with rough technical specifications.<ref name="journal2">'''Dr. Halsey's personal journal''' ''January 7, 2535''</ref> Nevertheless, Halsey rarely used the "Mark" verbiage to describe the suits, due to her objections with its imposition by ONI.{{Ref/Reuse|Enc22p77}}

After the end of the Human-Covenant War, the Materials Group developed the second system-wide generation of MJOLNIR, simply designated GEN2, as a response to the SPARTAN-IV project. GEN2 is lighter than the Marks IV through VI and is far more modular than previous systems. The previous iterations of MJOLNIR were retroactively designated GEN1 to distinguish them from the GEN2.<ref name="O+A">[http://halo.xbox.com/halo4#!an-epic-universe/ordnance-armor/cbbca9b3-5108-41aa-aa21-9b523de68266 '''Halo 4''': ''ORDNANCE + ARMOR'']</ref><ref name="Gameplay">[http://halo.xbox.com/halo4#!halo-evolved/gameplay/31afe32b-0e07-45c0-9424-3adc6e1eadca '''Halo 4 Official Site:''' ''GAMEPLAY'']</ref>

===Pre-production prototypes===

<!-- They should call this GEN0 in canon -->

Before any generation of MJOLNIR made it into formal production, a full decade was spent in the research and development phase of the program. Three major distinct development platforms emerged over this period, which would be retroactively designated Mark I, II and III, with each successively refining and building upon the last. Across these three platforms,{{Ref/Note|Id=EncFortySuits|The 2009 and 2011 editions of the ''Halo Encyclopedia'' claim that these manufactured suits were of the Mark I generation specifically, and that they were later "scrapped" - suggesting an intention to actually put them into service. However, the 2022 edition of the Encyclopedia revises this claim, stating that the "at least forty" manufactured suits were of the Mark I, II and III platforms overall (not Mark I specifically), and establishes that they were only ever testbeds for experimentation, never production-ready suits of armour. Due to the recency of the 2022 edition, and the frequent inaccuracies in the 2009 and 2011 encyclopaediae, this article favours the 2022 edition.}} at least forty different physical suits were assembled, each to a varying stage of completeness with regards to systems integration and functionality. Suits from this prototypical generation of MJOLNIR were never intended to be put into service, instead serving merely as development platforms for Halsey and her team to iterate on.{{Ref/Reuse|Enc22p77}} Ultimately, the key failing of all three of these prototype platforms was the reliance on a local, external power source, requiring either a physical tether or for the user to remain within range of [[broadcast power]]. This made the designs impractical on the battlefield, as their range was severely limited by the lack of a mobile power source.{{Ref/Reuse|ENCY}}

First developed in [[2515]], the Mark I was a development platform which served as a testbed for Halsey and her team to experiment with during the early stages of MJOLNIR development. Though bulky, unwieldy and difficult to control, the Mark I nevetherless pioneered the artificial muscles, embedded computer systems and control software that would become core to the MJOLNIR armour in later generations.{{Ref/Reuse|Enc22p77}} The suit also contained a cutting-edge onboard computer that could assist the wearer by transmitting tactical and communications information to the standard neural implant issued to a soldier, though the suit did not possess the ability to carry an AI.{{Ref/Reuse|ENCY}} Despite these successes, the Mark I had one fatal flaw which would have to be overcome before MJOLNIR could ever be truly practical in the field: due to the tremendous amount of energy needed to power it, it had to remain physically tethered to a power source while in use.{{Ref/Reuse|ENCY}}{{Ref/Reuse|Enc22p77}}{{Ref/Note|The 2009 and 2011 editions of the ''Halo Encyclopedia'' also claim that the Mark I allowed the user to lift up to two tons (4,000 pounds) and run at 32&nbsp;km/h (19.88&nbsp;mph) for extended periods of time. However, these statistics were ascribed to the unrelated [[Mark I prototype exoskeleton]] by ''[[Halo: The Fall of Reach]]'', and misattributed to MJOLNIR Mark I by the ''Encyclopedia''. Thus, they are not listed on this article.}}

 

====Mark II====

 

====Mark III====

 

Though an improvement, this design was still quickly rejected, for two main reasons. First, the armor still had a limited operational range as it had to remain within range of a bulky, immobile [[generator]]. Second, if said generator was disabled or destroyed, the suit would become inoperable, leaving its user locked inside the now-inoperable shell, helpless against enemy attacks.{{Ref/Reuse|ENCY}}

 

===GEN1 - First generation===

After a decade of research and development, MJOLNIR would, in [[2525]], enter what retroactively became known as GEN1 - the first generation of MJOLNIR to be actively deployed in the field. This generation lasted throughout the [[Human-Covenant War]], and was described as "revolutionary, in both form and function". Over the course of the generation, the design would see significant iteration and refinement, with the addition of many notable upgrades, including personal [[energy shielding]] and the ability to host an on-board AI to assist the wearer.{{Ref/Book|Id=Enc22p78|Enc22|Page=78-79}} Nevertheless, GEN1 was not without its drawbacks: it required extremely complex manufacturing methods to create, and each suit had to be custom-tailored for its Spartan wearer.{{Ref/Book|Id=Enc22p80|Enc22|Page=80}}

 

====Mark IV====

Despite the failure of the three earlier iterations of MJOLNIR, the MJOLNIR Mark IV armour would become the first MJOLNIR suit to see mass production and deployment onto the battlefield. Spearheaded by Dr. Catherine Halsey, the Mark IV was a radical redesign of the previous iterations. Most notably, it used an embedded miniature fusion reactor within the armour itself to power the suit, eliminating the cumbersome external generators that had plagued previous iterations. The MJOLNIR Mark IV armor was first fielded in November 27, 2525 and remained in service until November 24, 2551,<ref>[http://halo.bungie.net/News/content.aspx?type=topnews&link=BWU_012910 '''Bungie.net''': ''Bungie Weekly Update: 01.29.10'']</ref> though it received innumerable iterative upgrades in the interim.

====Mark V====

====Black====

====Mark VI====

====Mark VII====

===GEN2 - Second generation===

Generation 2 Mjolnir [GEN2] is a program-wide overhaul of the system primarily developed for the Spartan-IVs.{{Ref/Reuse|wp mjolnir}} Its most notable feature is the radical streamlining of the exoskeleton architecture, with the number of complex components reduced by an order of magnitude in comparison to GEN1 suits.<ref name="HOSFM">''[[Halo: Official Spartan Field Manual]]'', pg. 178-179</ref> The GEN2's design philosophy is geared toward integrating the vast majority of the armor's vital hardware into the bodysuit, known as a techsuit, enabling more streamlined production and easier implementation of specialized components.{{Ref/Reuse|wp mjolnir}} However, this sacrifices some of the suit's efficiency, and the performance improvements over GEN1 Mjolnir are minimal.{{Ref/Reuse|HOSFM}} The second generation uses a spiral-development model of production, enabling the UNSC and its corporate partners to iterate on the armor systems much faster and more efficiently than with the first generation.{{Ref/Reuse|wp mjolnir}} GEN2 is produced by half a dozen manufacturers, both within the military and among private contractors.{{Ref/Reuse|O+A}}{{Ref/Reuse|Gameplay}} It is equipped with new ''ad hoc'' modification systems which gives the armor the ability to use tactical packages, support upgrades, and armor abilities.{{Ref/Reuse|O+A}}{{Ref/Reuse|Gameplay}}

===GEN3 - Third generation===

MJOLNIR GEN3 is the third generation of Mjolnir armor, incorporating lessons learned from GEN2 line of Mjolnir, while also seeking to restore some of the favorable design characteristics and materials of the GEN1 line.{{Ref/Book|Id=Enc22p85|Enc22|Page=85}} GEN1 Mark VII was used as the testbed for GEN3 improvements and when GEN3 Mjolnir began to be produced in [[2559#February|February 2559]],{{Ref/Reuse|HOSFM}}{{Ref/Generic|Id=DH|[[Discover Hope]]}} Mark VII would for the first time receive a full production run.{{Ref/Site|Id=CFDespite|D=30|M=3|Y=2023|URL=https://www.halowaypoint.com/en-us/news/despite-distance|Site=Halo Waypoint|Page=Canon Fodder - Despite Distance}} GEN3 introduced numerous upgrades when compared to the GEN2 platform, including enhanced energy shielding capabilities, a more compact and efficient fusion reactor, and variable-density hydrostatic gel dispersal membranes. While GEN3 did increase the overall use of exotic composites, several innovations in the manufacturing process and a refinement of the platform's modularity have resulted in a suit of armor that is more cost-effective and versatile than both previous generations.{{Ref/Reuse|Enc22p85}} By [[2559#October|October 2559]], GEN3 Mjolnir armor would become the standard armor generation fielded by Spartans,{{Ref/Novel|Id=SOR2|SoR|Chapter 16}} though other armor systems such as the GEN1 [[B-class Mjolnir|Mark V[B]]] platform and its variants have been upgraded to be roughly equivalent to GEN3 Mjolnir, offering Spartans greater choice in the Mjolnir they field.{{Ref/Site|Id=CFParallel|URL=https://www.halowaypoint.com/en-us/news/parallel-threads|Site=Halo Waypoint|Page=Canon Fodder - Parallel Threads|D=30|M=3|Y=2023}}

The inner skinsuit is made of a moisture-absorbing synthetic material linked to an environmental control computer and the occupant's neural interface. It controls the suit's temperature and actively changes how the suit fits the user.{{Ref/Reuse|FoR3}}

The inner structure of the suit{{Ref/Book|Id=encyc91|[[Halo Encyclopedia (2011 edition)]]|Section=Project: MJOLNIR|Page=91}} is a layer of piezoelectric liquid crystal that deforms along a preferred axis when exposed to an electric charge.{{Ref/Reuse|journaljul}} This layer acts as a sheath or a suit of artificial muscle; this reactive piezoelectric effect increases the mobility, speed, and all-around physical performance of the suit's user,{{Ref/Reuse|journaljul}} doubling their strength and increasing the reaction time of the user by a multiple of five. The material is amorphous, which circumvents a major obstacle in its design: custom fitting millions of the polygonal pieces under the second armor layer.{{Ref/Reuse|journalsep}} Knitted together at a molecular level the liquid crystal material is merely "poured" into a multilayered Sierpinski capillary system where microelectric fields can direct crystallization geometries.{{Ref/Reuse|journalsep}} The only downfall is the material's production, which involves classified super-toxic precursor materials and requires a zero-gravity environment.{{Ref/Reuse|journalsep}}  

[[File:H4-MJOLNIR-Skinsuit.jpg|thumb|300px|The [[MJOLNIR Powered Assault Armor/Mark VI|MJOLNIR Mark VI]]'s 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.<ref name="ENCY3">'''Halo Encyclopedia: The Definitive Guide to the Halo Universe''', ''page 90''</ref>

The lockdown system protects muscles and joints from traumatic, high-impact injuries by seizing the suit into a rigid posture through modifying the density of the hydrostatic gel layer.<ref>''Halo 3'', level ''[[Arrival]]''</ref><ref>'''Halo Encyclopedia: The Definitive Guide to the Halo Universe''', ''page 91''</ref><ref>'''Halo: Reach''', level ''[[Tip of the Spear]]''</ref>

The most important feature though, is the direct neural interface system which connects to a Spartan's 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 subject's head and receptors in the brain link to the helmets on board sensors it creates the neural link needed to move the MJOLNIR suit.{{Ref/Reuse|ENCY}}

The outer shell of the Mjolnir armor is composed of a fairly thick titanium alloy. This plating covers the chest, arms, hip, legs, calves, 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 all MJOLNIR suits 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.{{Ref/Reuse|ENCY3}}  

Unsuccessfully tested with the Mark IV,<ref>'''Halo: The Essential Visual Guide''', ''page 119'': ''"Energy shielding was a key feature of Mark V, although other Spartan squads had field-tested prototypes of this technology as early as 2531."'' The Grenadier variant, introduced four years later, also served as a test bed for energy shielding.</ref> properly introduced with the Mark V, and later refined with the Mark VI, the energy shield device is reversed engineered from Covenant technology. In 2532,{{Ref/Reuse|ENCY2}} forty scientists and technicians would spend the next 20 years attempting to make some use of the technology. For decades the attempts at cracking their technology had met with failure after failure, some had given up and others in the scientific community believed the energy shield technology could never be cracked. However at some point in the late 2540s a breakthrough was made and for the first time the UNSC had successfully cracked and improved upon the technology.<ref>'''Halo: The Fall of Reach''', ''page 249'' (2001 edition) ''page 289'', (definitive edition) ''page 283-284'' (2010 edition)</ref>

Integrated into the final production model of the Mark IV in 2531, the microfusion cell is the most vital component to the Mjolnir system, as it provides power to all components of the armor. The reactor is built into the suit and allows for nearly unlimited power. The fusion reactor is half the size of a normal battery pack.<ref>'''Halo: The Fall of Reach''', ''page 114'', (2001 edition) ''page 131'' (definitive edition) ''page 137'' (2010 edition)</ref> Pre-2531 versions of the armor use a [[nuclear fission]] reactor as a source of power. However, because of the delicacy and radioactive nature of the fission reactor its use was limited until it was replaced with a fusion plant in the final production model of the Mark IV.{{Ref/Reuse|journal2}}<ref>'''Halo: Ghosts of Onyx''' ''page 45''</ref>

File:HCE John117 Concept 1.jpg|Shi Kai Wang's preliminary sketch of John-117 in what would become the Mjolnir Mark V for ''[[Halo: Combat Evolved]]''.

File:H3 Manual Cover Design 10.jpg|Concept art of John-117 undergoing armor diagnostics for ''[[Halo 3]]''.

File:H3 MjolnirMkVArmor Concept.jpg|A redux of the MJOLNIR Mark V for ''[[Halo 3]]''.

File:Halo Wars - Mark_IV.png|Concept art of the Mjolnir Mark IV for ''[[Halo Wars]]''

File:HINF Concept YoungChief.jpg|Concept art of a young John-117 in Mjolnir for ''[[Halo Infinite]]''.

File:HI E318 JohnReveal.png|John-117 in an early version of his GEN3 Mjolnir Mark VI  in the ''[[Halo Infinite announcement trailer]]''.

File:HINF-S5PK1.jpg|GEN1 Mark V and GEN3 Mark VI in ''Halo Infinite'' multiplayer.

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