Editing MJOLNIR Powered Assault Armor/Mark V

{{Status|Canon}}
{{Armor infobox
|image={{tabcontainer|title1=GEN3|content1=[[File:HINF-CEMark5Fullbody.png|350px]]|title2=GEN2|content2=[[File:H4 MJOLNIR Mark V.png|300px]]|title3=GEN1|content3=[[File:HFR John Render Front.png|350px]]}}
|manufacturer=[[Materials Group]]
|testsite=[[Damascus Testing Facility]]
|type=[[MJOLNIR Powered Assault Armor]]
|role=General combat
|weight=
|features=[[Energy shielding]]<br>Memory-processor superconductor layer<br>Automatic biofoam injectors
}}
{{Quote|This—is everything I had always dreamed it could be.|Dr. [[Catherine Halsey]]}}

The '''MJOLNIR Powered Assault Armor/Mark V''' was the second major version of the [[MJOLNIR Powered Assault Armor]] series.<!-- The exoskeletons that preceded MJOLNIR were not actually part of the MJOLNIR line. They were retroactively included at ONI's insistence.--> The initial version of the Mark V [[powered exoskeleton]], designated as [[MJOLNIR Powered Assault Armor/Mark V(B)|Mark V[B]]],<ref name="enc94">'''[[Halo Encyclopedia (2009 edition)]]''', ''page 94'' (2011 edition)</ref> was issued to the [[SPARTAN-II program|SPARTAN-IIs]] and several [[SPARTAN-III program|SPARTAN-III commandos]] on [[2551|November 24, 2551]],<ref>[http://halo.bungie.net/News/content.aspx?type=topnews&link=BWU_012910 '''Bungie.net''': ''Bungie Weekly Update, 1/29/10'']</ref> while the second version of the armor was unveiled for [[Operation: RED FLAG]] on [[2552#August|August 29, 2552]].<ref name="vis">'''Halo: The Essential Visual Guide''', ''page 119''</ref><ref name="enc">'''Halo Encyclopedia: The Definitive Guide to the Halo Universe (2011)''', ''page 97''</ref>{{Ref/Note|''Halo: The Fall of Reach'' and ''Halo Waypoint''<nowiki>'</nowiki>s ''MJOLNIR Project 2'' video state that the Mark V was issued on August 29, 2552. However, a number of later sources, including the aforementioned Weekly Update, Dr. Halsey's personal journal, the 2011 edition of the ''Halo Encyclopedia: The Definitive Guide to the Halo Universe'', and ''Halo: The Essential Visual Guide'' retcon this, clearly stating that the Mark V was issued on November 24, 2551. The two latter sources reveal that the suit issued in November 2551 was a prototype of the one issued in August 2552, explaining its noticeably different appearance in ''Halo: Reach''. While John-117 indeed tested the performance of the second-generation Mark V system, ONI was actually evaluating the Spartan-AI pairing made possible by the second-generation Mark V suit.}} The Mark V armor was in service until [[2552#October|October 2552]], when it was replaced by the [[MJOLNIR Powered Assault Armor/Mark VI|MJOLNIR Mark VI]].<ref>'''Halo 2''', campaign level ''[[The Armory]]''</ref> It could still be requisitioned by [[SPARTAN-IV program|SPARTAN-IV]] personnel as late as [[2558|October 2558]], albeit upgraded to function with the [[MJOLNIR Powered Assault Armor (GEN2)|MJOLNIR [GEN2]]] suite.<ref>'''[[Halo 4]]'''</ref><ref name="H5G">'''[[Halo 5: Guardians]]''' ''- Mark V Alpha armory description''</ref>

==Development history and design==
In [[2542]], seventeen years after the [[MJOLNIR Powered Assault Armor/Mark IV|MJOLNIR Mark IV]] entered service, production began on the next generation of MJOLNIR armor. A team under the leadership of Chief Scientist [[Catherine Halsey|Dr. Catherine Halsey]] would spend the next ten years developing the suit. Using data collected from the Mark IV, hundreds of minor technical improvements and several major changes were made to the Mark V; most notably, the suit's armor plating underwent a total redesign and better materials were developed for its use. Separating the Mark V from the previous version of the system were two major breakthroughs in the ways in which the suit improves its wearer's combat effectiveness.{{Ref/Reuse|enc}}

The first major breakthrough, which was introduced with the first generation of the Mark V, was the addition of a self-recharging [[Energy shielding#Human energy shielding|energy shield]] system, reverse-engineered from captured [[Kig-yar point defense gauntlet]]s,<ref name="ReferenceA">'''Halo: The Fall of Reach''', ''page ???''</ref> which repel objects and energy bursts, plus any other hazardous elemental energies. While impacts on the shield place a substantial drain on the system's power supply, the system's energy regenerates once the user is no longer under fire. However, the adaptation of the shield covering the entire body weakens the magnetic field, making the Mark V's shield system vulnerable to sustained fire. Energy shield technology was first tested on the Mark IV, though such tests were not especially successful.{{Ref/Reuse|vis}}<ref>Dr. Halsey's personal journal</ref>

The second major advancement, which was not implemented until the second generation of the suit,{{Ref/Reuse|vis}}{{Ref/Reuse|enc}} was the addition of a layer of computer memory superconductor that would allow an [[artificial intelligence]] to piggyback into the field with the operator to both provide and gather real-time intelligence. The synthesis of an artificial intelligence with a human brain is not possible without an upgrade to the user's already-specialized [[SPARTAN neural interface|neural interface]]. Like the standard neural interface, the specialized neural lace translates electrochemical signals to digital code and routes them through an interface connection at the rear of the skull. Through this interface, the user's thoughts command the armor's movement and weapons, and input from the on-board sensors is fed directly to the user's mind. In addition, an AI personality and processing matrix can be carried by the armor and delivered to the suit via the specialized neural lace and on-board storage in a crystal data chip no larger than a personal credit card. Without the armor, a Spartan's reaction time is charted at twenty milliseconds; with the Mark V, and an AI on-board, the time required to translate thought into motion is rendered almost instantaneous.

The suit also possesses other upgraded features that enhance its wearer's abilities. It has an upgraded [[heads-up display]] linked to sensors that project shield strength and an improved motion detecting system in addition to providing other numerous readouts, including allies' vitality and shield status. These features are maintained and initialized by the [[Mark V BIOS]] firmware. 

In its second phase, the Mark V MJOLNIR battle armor weighs 321.3 kilograms,<ref name="DD5">[[Data Drop]] [[Data Drop/Five|Five]]</ref> The SPARTAN/MJOLNIR combination is designed to be the most devastating intelligence tool ever created, as the AI can greatly increase the wearer's reaction time and vastly improve intelligence gathering capacity.

[[John-117]] was the first Spartan to test the second-generation MJOLNIR Mark V with a smart AI implemented within the armor during a "live-fire" combat scenario.{{Ref/Reuse|vis}} His test was to [[Ring the Bell|ring a bell]] after going through an obstacle course. This course involved ten [[Orbital Drop Shock Trooper]]s, a minefield with [[Lotus anti-tank mine]]s, three automated 30mm chain guns, a forest of wooden poles, and an unexpected [[SkyHawk]] jumpjet utilizing four 50mm cannons and [[Scorpion missile]]s. This test showed that an AI could vastly improve the armor's reaction times.{{Ref/Reuse|ReferenceA}}

After the Human-Covenant War, the Mark V MJOLNIR components were adapted for the use of the SPARTAN-IV in the MJOLNIR (GEN2) armor. The GEN2 variant of the Mark V was tested at the [[Damascus Testing Facility]] in [[Vhalkem]] on [[Chi Ceti IV]], a significant MJOLNIR development site for several decades.<ref>[http://blogs.halowaypoint.com/Headlines/post/2013/07/10/The-Halo-Bulletin-71013.aspx '''The Halo Bulletin''': ''7.10.13'']</ref>

==Armor variants==
===GEN1===
[[File:VanityMkV.png|thumb|250px|A Mark V [B] suit, customised with a baseline Mark V helmet and Mark V shoulder pads, all of which were available as of November 2551.]]
A large number of variants of the Mark V were manufactured for use in the field. In addition, the armor system is compatible with components and variants created for the earlier or later MJOLNIR generations.

====Known variants====
Variants compatible with the Mark V include, but are not necessarily limited to:
*'''[[AIR ASSAULT-class Mjolnir|MJOLNIR/AA]]''' - Air Assault - Developed as a part of a project to improve the ODST helmet and issued to [[UNSC Army airborne|Army airborne]] units.
*'''[[B-class Mjolnir|MJOLNIR/B]]''' - B-class - Privately manufactured initial production model of the Mark V set; the helmet is issued exclusively to [[UNSC Special Forces#Unified Special Warfare Command|SPECWARCOM]] [[Special Warfare Group Three|Group Three]].
*'''[[CQB-class Mjolnir|MJOLNIR/C]]''' - CQB - A more advanced close-quarters combat variant.
*'''[[CQC-class Mjolnir|MJOLNIR/CQC]]''' - CQC - Designed for close-quarters combat. Precursor of the MJOLNIR/C CQB variant.
*'''[[EOD-class Mjolnir|MJOLNIR/EOD]]''' - EOD - A variant designed for [[wikipedia:Bomb disposal#EOD|explosive ordnance disposal]].
*'''[[FJ/PARA-class Mjolnir|MJOLNIR/FJ/PARA]]''' - FJ/Para - A lightweight variant for airborne units.
*'''[[GRENADIER-class Mjolnir|MJOLNIR/G]]''' - Grenadier - This G variant is an up-armored prototype based on the basic Mark IV helmet.
*'''[[GUNGNIR-class Mjolnir|MJOLNIR/G]]''' - GUNGNIR - This G variant was developed for Mark V as part of [[Project GUNGNIR]] alongside the [[M6 Spartan Laser|M6 Grindell/Galilean Nonlinear Rifle]].
*'''[[HAZOP-class Mjolnir|MJOLNIR/HAZOP]]''' - HAZOP - A variant for missions considered too hazardous for standard equipment.
*'''[[JFO-class Mjolnir|MJOLNIR/J]]''' - JFO - A variant that improves artillery request communication/coordination.
*'''[[COMMANDO-class Mjolnir|MJOLNIR/K]]''' - Commando - Developed to improve a Spartan's tactical awareness on the battlefield.<ref>'''Halo: The Essential Visual Guide''', ''page 33''</ref>
*'''[[SECURITY-class Mjolnir|MJOLNIR/M]]''' - Security - Privately manufactured variant designed for security personnel.
*'''[[MP-class Mjolnir|MJOLNIR/MP]]''' - Military Police - A variant of the standard-issue [[CH252 helmet]]. A shared asset among all branches of the [[United Nations Space Command]] armed forces, primarily [[Beta-5 Division|Beta-5]] [[military police]].
*'''[[ODST armor|MJOLNIR/ODST]]''' - The Mark V is compatible with several parts of the ODST armor, including the helmet, chest-piece, and shoulder pauldrons.
*'''[[OPERATOR-class Mjolnir|MJOLNIR/Operator]]''' - Operator - Variant for the ONI's Beta-5 Asymmetrical Action Group.
*'''[[PILOT-class Mjolnir|MJOLNIR/Pilot]]''' - Pilot - A variant developed for use by the [[UNSC Air Force]] that was adapted for compatibility with the Mark V.
*'''[[RECON-class Mjolnir|MJOLNIR/R]]''' - Recon - A variant specialized for reconnaissance missions, developed parallel to the ''S'' variant. 
*'''[[SCOUT-class Mjolnir|MJOLNIR/S]]''' - Scout - A variant with limited stealth capabilities, developed parallel to the ''R'' variant.
*'''[[TRACKER-class Mjolnir|MJOLNIR/Tracker]]''' - Tracker - A variant designed to aid in long-range pursuit of targets.
*'''[[EVA-class Mjolnir|MJOLNIR/V]]''' - EVA - Variant that specialized to improve survivability of Spartans when performing extra-vehicular activity in vacuum.

====Mark VI prototype====
In [[2552]] prior to the [[Fall of Reach]], a Mark VI helmet was tested on Mark V armor alongside the '''[[RECON-class Mjolnir|Recon]]''' armor set.

====Supplemental armor and accessories====
*'''[[Armor accessories/Assault|Assault]]''' - For close to medium distance combat.
*'''[[Armor accessories/Collar|Collar]]''' - Armor that covers the back of the neck.
*'''[[Armor accessories/HP|HP (Hard Point)]]''' - Additional armor plating and hard points for missions involving [[wikipedia:High-altitude military parachuting#HALO – High Altitude Low Opening|High-Altitude Low Opening jumps]].
*'''[[Armor accessories/Jump Jet|Jump Jet]]''' - Safety restraints for use with a [[jetpack]].
*'''[[Armor accessories/Sniper|Sniper]]''' - Shoulder armor attachment designed for carrying sniper rifle ammunition.
*'''[[Armor accessories/Tactical|Tactical]]''' - Various pouches, webbing and electronics accessories.
*'''[[Armor accessories/UA|UA (Up-Armor)]]''' - Supplemental armor attachments.

====Attachments====
*'''[[Command Network Module]]''' - CNM
*'''[[CBRN module|Chemical, Biological, Radiological and Nuclear module]]''' - CBRN
*'''[[Hardened Uplink]]''' - HUL

====Mark VI upgrade====
In late [[2552]], all surviving Mark V helmets received an upgrade with then current-issue internal components and software [[MJOLNIR Powered Assault Armor/Mark VI|Mark VI]].
<gallery>
File:Halo 3 - Mark V.png|Upgraded Mark V helmet for Mark VI armor systems.
</gallery>

===GEN2===
As of [[2558]], the Mark V has been upgraded to function with the [[MJOLNIR Powered Assault Armor (GEN2)|MJOLNIR [GEN2]]] suite.

====Known variants====
*'''Hybrid GEN2/Mark V [GEN1]'''
This variant is largely based on the GEN1 variant but with heavily modified components to meet the standards of GEN2 armor. Some contemporary [[SPARTAN-IV program|Spartan-IVs]] use this armor in [[2558]].<ref>http://worthplaying.com/article/2013/7/6/news/89850/</ref>
<gallery>
File:H4 MJOLNIR Mark V.png|Hybrid GEN2/Mark V [Gen 1].
File:H4 Mark V front and back.png|Profile of this variant.
</gallery>
*'''[[Mark V Alpha]]'''
The Mark V Alpha is a highly configurable version of the original Mark V armor. Though it is unclear who requested an integration check for the Mark V helmet with the latest GEN2 architecture, engineers at Materials Group have been surprised at the MARK V ALPHA's near-parity with contemporary designs.{{Ref/Reuse|H5G}}<ref>[https://www.halowaypoint.com/en-us/news/canon-fodder-armory-amore '''Halo Waypoint''': ''Canon Fodder - Armory Amore'']</ref>
<gallery>
File:H5-MarkV_Front-Back.png|Mark V Alpha.
</gallery>
*'''[[Mark V Delta]]'''
The Mark V Delta helmets are sourced from a cache of SPARTAN-II materials uncovered at the Seongnam Special Warfare Center and are compatible on the GEN2 platform. A few are even etched with the hand-carved ID number of Spartans long-since marked MIA.<ref name="H5G1">'''Halo 5: Guardians''' ''- Mark V Delta armory description''</ref>
<gallery>
File:Mark V delta.png|Mark V Delta.
</gallery>

===GEN3===
As of [[2560]], the Mark V has been upgraded to function with the [[MJOLNIR Powered Assault Armor (GEN3)|MJOLNIR [GEN3]]] suite.

====Known variants====
*'''[[Mark V Zeta]]'''
An upgraded Mark V variant, the Mark V Zeta helmet was used by Spartans assigned to ONI's [[Xeno-Materials Exploitation Group]] on [[Installation 07]]. It's high-threat response and surveillance interlinks systems were considered ideal for Zeta Halo's peculiar operating environment.{{Ref/Site|Id=CFParallel|URL=https://www.halowaypoint.com/en-us/news/parallel-threads|Site=Halo Waypoint|Page=Canon Fodder - Parallel Threads|D=25|M=6|Y=2021}}
<gallery>
File:HINF - Desert Splinter armor coating (Transparent).png|Mark V Zeta.
</gallery>

==Upgrades==
Various upgrades were also designed along with the standard Mark V, in ONI's [[CASTLE Base]] on [[Reach]] to aid certain Spartans' abilities in combat. The following is a list of known upgrade components and variants:

*'''Neural induction circuits''' - Allowed the armor to respond to the wearer's movement at a faster rate.<ref name="Strike">'''Halo: First Strike''', ''page 140''</ref>
*'''Linear accelerator''' - Doubles the strength of the energy shield system and allows the MJOLNIR to take more hits before failing.{{Ref/Reuse|Strike}}
*'''Image enhancing computer''' - Better visual display on the MJOLNIR's heads-up display.{{Ref/Reuse|Strike}}
*'''Improved tracking system''' - Better tracking system on the MJOLNIR'S heads-up display, which improved accuracy at distances up to a thousand meters.{{Ref/Reuse|Strike}}
*'''Improved motion sensors''' - Improves sensitivity readings on the motion tracker allowing for more accurate readings.{{Ref/Reuse|Strike}}

In addition, the Mark V armor supports different types of additional attachments, which enable [[Armor abilities|various abilities]]. Some of these may be related to the add-ons described above. The armor is also compatible with various types of propulsion equipment, such as [[thruster pack]]s and [[Series 8 jetpack]]s.

*'''[[Armor lock]]''' - A compact generator device on the back of the user generates a powerful shield, whilst simultaneously engaging the suit's lockdown system. This offers temporary near-invulnerability to all ground weaponry and sends out an [[electromagnetic pulse]] once the lockdown is disengaged.
*'''[[Armor Abilities#Active Camouflage|Active camouflage emitter]]''' - The active camouflage plug-in can make the user nearly invisible for brief periods of time. As a drawback, the more the user moves, the more visible they becomes. In addition, all sound is muffled to the user while the camo is engaged, and the motion sensor is rendered virtually inoperative.
*'''[[Armor Abilities#Hologram|Hologram module]]''' - A device on the back of the armor allows a hologram to be sent out to draw enemy fire.
*'''[[Armor Abilities#Sprint|Sprint module]]''' -  A module that bypasses the safety limiters of the suit's actuators and "muscles", allowing better performance at the expense of heat regulation, overheating and fatiguing the user if used for prolonged periods.

==Armor components==
[[File:HCE-MarkV.png|thumb|200px|[[John-117]] wearing the Mark V armor.]]
*'''Helmet''': The helmet is one of the most crucial aspects of 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. 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. The helmet also contains the AI housing, where a ship-borne AI chip can be inserted, located on the back of the helmet. The Mark V helmet is an upgraded version of the Mark IV helmet, modified to function with the Mark V's energy shield systems,<ref>'''Halo: Reach''', ''[[Armor customization (Halo: Reach)|Armory]]''</ref> though, like the rest of the Mark V system, it likely incorporates several other changes as well. The helmet supports various external upgrades, such as a Command Network Module and Up-Armor plating.

*'''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, 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 the 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.

*'''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.

*'''[[Hydrostatic gel]] layer''': Underneath the armored bodysuit is a gel-filled layer, this gel layer regulates the temperature of the suit and can reactively 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.<ref>'''[[Halo: First Strike]]''', "Chapter 2", ''page 13''</ref><ref>'''Halo: Ghosts of Onyx''', ''page 36''</ref>

*'''[[Polymerized lithium niobocene|Reactive crystal layer]]''': Sandwiched between the external armor and the internal padding is a layer of piezoelectric material that deforms along a preferred axis when exposed to an electric charge. When creating the suit, the liquid crystal material is poured into a capillary system where electric charges can direct the formation of crystal geometries.<ref>'''[[Dr. Halsey's Personal Journal]]''', ''September 1, 2525''</ref> This layer acts as synthetic muscle, allowing the Spartan access to approximately twice their normal strength.  This is not due to a "Leverage Effect", but rather having the mechanical systems performing in tandem; relative to their biologically augmented operators.
*'''Memory-processor superconductor layer''': A layer relatively new to the MJOLNIR line, introduced with the Mark V, that is capable of housing an A.I.  Comprised of the same material as a starship's A.I. system, this layer allows an A.I. to travel with a soldier into the field.  The A.I. can then aid the soldier in software intrusion, hardware hacking, and espionage by listening to enemy chatter.<ref>'''Halo: The Fall of Reach''', ''page 286''</ref>  As a side note, this layer is often confused with the Reactive Metal Liquid Crystal layer, which due to the latter's piezoelectric properties is impossible.

*'''Magnetic weapon holder strips''': The MJOLNIR armor features very small, yet powerful magnets placed on the legs, waist, and back of the suit that are used to hold any equipment or any weapons with a magnetic property. The suit also contains a magnet system within its boots that allows its wearer to stay attached to a metal surface in zero G environments and can be toggled on or off by the wearer.

*'''[[Energy shielding#Human Energy Shielding|Energy shields]]''': First used on the Mark V, and later refined on the Mark VI, the energy shield device is reverse engineered from Covenant technology. Beginning in 2532<ref>'''[[Halo Encyclopedia (2009 edition)]]''', "Chapter 3", ''page 89''</ref> forty scientists and technicians would spend the next twenty 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 before 2552 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''</ref>

*'''[[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, only breaking under extreme pressure, such as in a high velocity impact or when the hydrostatic gel has been overpressurized.

*'''[[Biofoam|Automatic biofoam injectors]]''': Biofoam injectors are an integral component of the systems that keep a SPARTAN-II functioning in battle even after injuries which would otherwise incapacitate the wearer.<ref>'''Halo: First Strike''', ''page 244'' (2003)</ref>{{Ref/Note|The subsequent Mark VI generation's automatic biofoam injectors supposedly serve as the fictional explanation for the player's regenerating [[health]] in ''Halo 2'', while the non-regenerating health in ''Halo: Combat Evolved'' and ''Halo: Reach'' seemingly suggests that the injectors were not present in the Mark V suit. However, this is merely a gameplay-related change as ''Halo: First Strike'' establishes that the Mark V was equipped with biofoam injectors.}} Biofoam is a medical gel that is used to fill and seal a wound automatically as well as to treat any infection that could occur as a result of the wound.

*'''Biofoam injection ports''': The Mark V armor possesses injection ports where a direct supply of biofoam or other medicines can be administered from a standard military first aid kit when the wearer is injured.<ref>'''Halo: First Strike''', ''page 123'' (2003)</ref>

*'''Fusion reactor''': The fusion reactor is the most essential part of the MJOLNIR system, as it provides power to all equipment used by the 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 battery pack that conventional marines carry around.<ref>'''Halo: The Fall of Reach''', ''page 114''; ''page 248''</ref>

*'''[[Force-multiplying circuit]]s''': Located throughout the armor, these systems boost the force applied by the user. They make hand-to-hand combat easier, but also make the armor difficult to adjust to; a slight motion can be translated into a potentially harmful one if not conducted correctly. For this reason it is only possible for Spartans to use this armor, as their strengthened bodies are able to withstand the increased power and speed of movement, which, in unaugmented human bodies, results in broken bones or death due to spasms caused by the pain of broken bones.

*'''[[Reactive circuit]]s''': Reactive circuits are systems directly linked into the wearer's [[Spartan Neural Interface|neural interface]]. They amplify the wearer's reaction time by connecting directly to the thoughts of the wearer, making it much easier to control and allowing for the soldier to be both more efficient and have a higher survival rate in combat.

*'''[[MJOLNIR Power Supply Control Unit|Power supply control unit]]''': The power supply control unit controls the power supply of the armor.

*'''[[Mark V BIOS|MJOLNIR Mark V BIOS]]''': The basic input/output system, standard firmware interface for the Mark V.

*'''Lock-down system''': The lock-down 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''', campaign level ''[[Arrival]]''</ref><ref>'''Halo Encyclopedia: The Definitive Guide to the Halo Universe''', ''page 91''</ref><ref>'''Halo: Reach''', campaign level ''[[Tip of the Spear]]''</ref><ref>[http://www.youtube.com/watch?v=eLmtVh_bmhs '''YouTube''': ''Halo Reach Legendary Edition Developer Commentary Part 4'']</ref>

*'''[[Fail-safe detonation system]]''' - This system functions as a self-destruct mechanism in order to prevent a dead Spartan's armor from being compromised by hostiles. It is activated by a series of digits that only the Spartans know. When engaged, it produces a reactor overload that burns everything within a ten-meter radius, then produces a large blast.<ref>'''Halo: First Strike''', ''page 315''</ref>

==Performance and durability==
[[File:Mark V after missile.png|thumb|200px|Mark V being struck by a Scorpion missile.]]
The Mark V armor was a major upgrade from the previous version of MJOLNIR armor. With the inclusion of energy shielding, this iteration of MJOLNIR is extremely resistant to not just gunfire and explosions, but plasma weaponry as well. While [[John-117]] was field testing Mark V MJOLNIR on [[Reach]] in [[2552]], his armor's shields were not only able to take the hits from multiple 30mm chain guns, but it was also able to withstand the blast from a [[Scorpion missile]].<ref>'''[[Halo: The Fall of Reach]] - Definitive Edition''', ''pages 301-302, 304-305''</ref> 

During the [[Fall of Reach]], the Mark V armor worn by the Spartan IIs of Red team was able to sustain the lives of most them and even keep functioning after hitting the ground at terminal velocity.<ref>'''[[Halo: First Strike]] - Definitive Edition''', ''22 - 24''</ref> However, the armor of the survivors suffered damage. [[Frederic-104]] had to replace a broken pressure seal using one taken from the armor of deceased Spartan [[Malcolm-059]].<ref>'''[[Halo: First Strike]] - Definitive Edition''', ''page 31''</ref> Doctor Halsey later had the surviving Spartans recover armor parts that were being field-tested from [[CASTLE Base]] to replace the damaged components of Fred, [[William-043]], [[Kelly-087]], [[Vinh-030]] and [[Isaac-039]].<ref>'''[[Halo: First Strike]] - Definitive Edition''', ''pages 152, 171-172''</ref>

During the [[Battle of Installation 04]], John-117's Mark V armor was able to withstand the "wash" from an off-target plasma bolt from a [[Mgalekgolo]]'s [[assault cannon]].<ref>'''[[Halo: The Flood]]''', Chapter 6, ''page 167'' (2003 paperback);''page 186'' (2010 paperback)</ref> Later during the battle, [[Cortana]] is able to adjust the suit's shield system to deliver an [[EMP]] to knock out [[Installation 04]]'s [[phase pulse generator]]s when John steps into them. The EMP briefly drains John's shields each time. She later uses the armor's power supply to power a jump using the installation's [[teleportation grid]] from the vicinity of the Control Room to the ''[[Truth and Reconciliation]]''. Cortana stated a belief that doing so wouldn't permanently damage the suit's power supply, but wasn't entirely sure and believed that they should only try it once.{{Ref/Level|CE|[[Two Betrayals]]}}{{Ref/Novel|TF|Chapter=10}} One of the problems that was later listed by a [[Unidentified master gunnery sergeant|gunnery sergeant]] was a fried power source, something that the teleportation presumably contributed to.{{Ref/Reuse|Heretic}}

During the [[Skirmish over Threshold]], due to damage from a plasma blast to the armor's chest at relatively close range with the shot raising the armor's internal temperature to over sixty degrees Celsius, John's armor's energy shields were knocked off-line and unable to recharge. Furthermore, due to damage from a [[Stealth Sangheili]]'s [[Type-1 energy sword]], the armor was breached. However, the armor was able to function fine without the shields and breached, though John was forced to adjust his tactics to match his lack of shields. A [[Huragok]] was later able to repair the damage to the shield system and restore the energy shields on the orders of [[Cortana]].<ref>'''[[Halo: First Strike]] - Definitive Edition''', ''pages 90-96 103-106, 112-120''</ref> The suit itself was later repaired at some point which allowed John to take part in a zero-gee operation on the hull of the ''[[Ascendant Justice]]'' where John's suit and that of the rest of [[Blue Team]] saved them from a near-miss from a Covenant [[plasma torpedo]], though [[Anton-044]] and [[Li-008]] were vaporized from a direct hit by the torpedo. The near-miss severely damaged the armor of the surviving Spartans, but Doctor Halsey was able to repair it.<ref>'''[[Halo: First Strike]] - Definitive Edition''', ''pages 264-270''</ref>

During [[Operation: FIRST STRIKE]], a [[Jiralhanae]] was able to break through John's shields through brute force and strangle him within the armor. Even with the Jiralhanae strangling him, the armor's shields still began to recharge. Once they reached one-quarter charged, John was able to combine the repulsive force generated by the shield and his own training to break free and kill the Jiralhanane.<ref>'''[[Halo: First Strike]] - Definitive Edition''', ''pages 373-375''</ref>

However, the armor had limits to its durability. Shortly before the [[Battle for Earth]], ''[[Cairo Station (station)|Cairo Station's]]'' [[Unidentified master gunnery sergeant|Master Gunnery Sergeant]] told John that his plating was about to fail, there was viscosity throughout the gel layer, the optics were totally fried ''"and let's not even talk about the power supply,"'' suggesting that the stress that was put on the armor from the Battle of Installation 04 and the following conflicts as well as the damage that was accumulated during those conflicts had damaged John's suit beyond repair by the time that he had reached Earth.{{Ref/Level|Id=Heretic|H2|[[The Heretic]]}} However, by this point, John's Mark V was obsolete and it was replaced by the [[MJOLNIR Powered Assault Armor/Mark VI|Mark VI]].{{Ref/Level|H2|[[The Armory]]}}

{{Expand-section}}
{{Clear}}

==In-game information==
===''Halo 3'' - GEN1===
The second version of the Mark V helmet is the only part of the armor available to the player, it is unlocked by getting the [[UNSC Spartan]] [[achievement]].

{| class="wikitable" style="width: 75%;"
! style="width: 15%"|Helmet
! style="width: 55%"|Description
! style="width: 15%"|Unlock requirements (''Halo 3'')
! style="width: 15%"|Unlock requirements (''Halo: MCC'')
|- align="center"
|rowspan=4|[[File:HTMCC H3 MarkV Menu Render.png|100px]]<br/>Mark V
|align="left"|'''Helmet:''' Originally issued in August 2542, all extant Mark V helmets have been upgraded with current-issue internal components and software.
|rowspan=4|Reach the rank of {{Rank/H3|sgt|1|grade}} (''[[UNSC Spartan]]'')
|rowspan=4|Unlocked by default.
|- align="center"
|align="left"|'''MCC:''' All extant MARK V helmets have been upgraded with current-issue components.
|}

===''Halo: Reach'' - GEN1===
{{Quote|Issued in November 2551, this helmet is fully compatible with all current armor systems.}}
The first version of the Mark V helmet and shoulder pauldrons are available as [[Armor customization (Halo: Reach)|armor permutations]] in ''[[Halo: Reach]]''. The helmet is first able to be viewed at the [[Rank (Halo: Reach)|rank]] of Captain, and is purchasable at Lt. Colonel.
{| class="wikitable" style="width: 75%;"
! style="width: 15%"|Armor
! style="width: 55%"|Description
! style="width: 15%"|Unlock requirements (''Halo: Reach'')
! style="width: 15%"|Unlock requirements (''Halo: MCC'')
|- align="center"
|[[File:HR MarkV Helmet Icon.png|75px]]<br/>Mark V
|align="left"|The Mk. V helmet is essentially the Mk. IV upgraded to function with MJOLNIR's new shield system.
|{{Rank/HR|ltcol|link=yes}}, 130,000 cR
|[[Series 1: Noble|Series 1]], Tier 60 ({{SeasonPoint|1}})
|- align="center"
|[[File:HR MarkV CNM Helmet Icon.png|75px]]<br/>Mark V ([[Command Network Module|CNM]])
|align="left"|Command network module; standard issue to UNSC Special Forces unit commanders.
|{{Rank/HR|ltcol|link=yes}}, 10,000 cR
|[[Series 1: Noble|Series 1]], Tier 60 ({{SeasonPoint|1}})
|- align="center"
|[[File:HR MarkV UA Helmet Icon.png|75px]]<br/>Mark V ([[Armor accessories/UA|UA]])
|align="left"|Up-armored variant of the base Mk. V pattern helmet.
|{{Rank/HR|ltcol|link=yes}}, 15,000 cR
|[[Series 1: Noble|Series 1]], Tier 60 ({{SeasonPoint|1}})
|- align="center"
|rowspan=2|[[File:HR MarkV LShoulder Icon.png|75px]][[File:HR MarkV RShoulder Icon.png|75px]]<br/>Mark V shoulders
|align="left" rowspan=2|Issued in November 2551, it is compatible with all powered and semi-powered armor systems.
|{{Rank/HR|brig|link=yes}}, 100,000 cR (left shoulder)
|rowspan=2|[[Series 1: Noble|Series 1]], Tier 80 ({{SeasonPoint|1}})
|- align="center"
|-align="center"
|{{Rank/HR|brig|link=yes}}, 80,000 cR (right shoulder)
|}

===''Halo 4'' - GEN2===
{| class="wikitable" style="width: 75%;"
! style="width: 20%"|Armor
! style="width: 40%"|Description
! style="width: 20%"|Unlock requirements (''Halo 4'')
! style="width: 20%"|Unlock requirements (''Halo: MCC'')
|- align="center"
|[[File:HTMCC H4 MarkV Helmet Icon.png|75px]]<br/>Helmet
|align="center" rowspan="5"|'''Description (H4 and MCC):''' Favored by some Spartan-IVs due to its classic simplicity and unparalleled reputation.<br/>
|rowspan="5"|Purchase the ''Infinity Armor Pack''.
|[[Series 7: Elite|Series 7]] Tier 2, {{SeasonPoint|1}}
|- align="center"
|[[File:HTMCC H4 MarkV Chest Icon.png|75px]]<br/>Chest
|[[Series 7: Elite|Series 7]] Tier 16, {{SeasonPoint|1}}
|- align="center"
|[[File:HTMCC H4 MarkV RShoulder Icon.png|75px]][[File:HTMCC H4 MarkV LShoulder Icon.png|75px]]<br/>Shoulders
|[[Series 7: Elite|Series 7]] Tier 55, {{SeasonPoint|1}}
|- align="center"
|[[File:HTMCC H4 MarkV ForearmIcon.png|75px]]<br/>Forearms
|[[Series 7: Elite|Series 7]] Tier 33, {{SeasonPoint|1}}
|- align="center"
|[[File:HTMCC H4 MarkV Leg Icon.png|75px]]<br/>Legs
|[[Series 7: Elite|Series 7]] Tier 45, {{SeasonPoint|1}}
|}
===''Halo Infinite'' - Upgraded GEN1===
The Mark V helmet, its attachments, and an accompanying set of shoulders were made available for [[multiplayer]] Spartan [[Armor customization (Halo Infinite)|armor customization]] in ''[[Halo Infinite]]''. The Mark V helmet became available to unlock during the [[Winter Update]], as the final unlock within the season's pass. The shoulders are available under the [[SAP attachments|SAP series of shoulder pads]] on the [[B-class Mjolnir|Mark V [B] armor core]] through the [[Season 01: Heroes of Reach]] battle pass. [[Season 05: Reckoning]] added the ''Halo: Combat Evolved'' Mark V as an armor kit on the [[Mark VII]] core.
{| class="wikitable" style="width: 75%;"
! scope="col" style="width: 15%" |Armor
! scope="col" style="width: 15%" |Manufacturer
! scope="col" style="width: 45%" |Lore
! scope="col" style="width: 10%" |Rarity
! scope="col" style="width: 15%" |Unlock Requirements
|-
|align="center"|[[File:HINF Mark V Helmet Icon.png|75px]]<br/>MARK V
|Materials Group
|The MARK V project began as a reference design by Materials Group; a technical blueprint that other manufacturers could adapt for their own MJOLNIR patterns.
|Legendary
|Winter Update Battle Pass level 30
|-
|align="center"|[[File:HINF SAP MKVI LShoulder Icon.png|75px]][[File:HINF SAP MKVI RShoulder Icon.png|75px]]<br/>[[SAP attachments|SAP]]/MKV{{Ref/Note|Id=MarkV|SAP/MKVI in Season 01: Heroes of Reach.}}
|Materials Group
|Compatible with almost all MJOLNIR generations and variants.
|Epic
|
*Left: Season 01: Heroes of Reach Battle Pass level 82 (Premium)
*Right: Season 01: Heroes of Reach Battle Pass level 83 (Premium)
|-
|align="center"|[[File:HINF-CursedGuardLshoulder.png|75px]][[File:HINF-CursedGuardRshoulder.png|75px]]<br/>Cursed Guard
|The [[Flood]]
|What is lost to the parasite can never truly be reclaimed.
|Legendary
|Purchase "Contaminator" Bundle from the Shop for 2,000 cR
|-
|align="center"|[[File:HINF-CEMarkV.png|75px]]<br/>Combat Evolved Mark V
|Materials Group
|This is no place for subtlety. This is no place for pity. This is a place where aliens want to turn humans into a bad memory. This is a place where strategy matters indoors and out, where your weapons and vehicles are both human and alien. This is a place for carnage. This is HALO.
|Legendary
|Purchase from the [[Shop]] for 2,200 cR
|}

== Production notes ==
[[File:HaloReach - John117.png|thumb|John-117 wearing the Mark V in ''Halo: Reach''.]]
During the early development stages of ''Halo: Combat Evolved Anniversary'', John-117 wore the first-generation Mark V armor seen in ''Halo: Reach''<nowiki/>'s armor permutations,<ref name="bts">[http://halo.xbox.com/en-us/intel/featured/video/bts-anniversary-campaign/8a902cd8-dc45-4a35-88ae-39ba04ba8a41 '''Halo Waypoint''': ''BTS: Anniversary Campaign'']</ref> though he had canonically already upgraded to the second-generation version. In the final game, he wears a second-generation suit, like he wears in the original game and in canon, which appears greatly different from the first-generation suit seen in ''Halo: Reach''. While this conflicts with his appearance in the cryo Easter egg from ''Halo: Reach'', his armor is not meant to be seen in any great detail in the Easter egg, making this discrepancy inconsequential.

During the development of ''Halo: Reach'', what was to labeled as the FJ/PARA knee guards were often used as if they were standard Mark V knee guards, given the fact that the player's character was often wearing them. For unknown reasons, towards the end of the game's development cycle, these knee guards were established as a secondary type rather than the base type, which was added during this period of time. The concept art of the Mark V for ''Halo: Combat Evolved'' had the armor's knee guards being noticeably larger than the final character model's, which were reduced in size and function to being somewhat square plates of metal partially wrapping around the knee. In the context of ''Halo: Reach'', the earlier concept art and abandoned ''Halo 3''-era revisions closely resemble the knee guards of the Grenadier variant. However, despite any of the visual similarities, neither these concepts or their predecessors match the movement qualities of all four knee guard sets in ''Halo: Reach''.
{{Clear}}

==Gallery==
{{Linkbox|gallery=yes|gallerypage=Images of MJOLNIR Mark V}}
<gallery>
File:HCE John117 Concept 1.jpg|[[Shi Kai Wang]]'s preliminary sketch of the Master Chief in early design of MJOLNIR armor for ''[[Halo: Combat Evolved]]''.
File:H2_MarkV_Detail_Concept.jpg|Early ''[[Halo 2]]'' concept art of the MJOLNIR Mark V.
File:Still 01.jpg|A render of the Mark V armor.
File:HCE Mjolnir Mark V.png|The Mark V in ''Halo: Combat Evolved''.
File:HTMCC HCE Spartan Player.png|The ''Halo: Combat Evolved'' Mark V armor rendered in [[wikipedia: Unreal Engine 4|Unreal Engine 4]] in ''[[Halo: The Master Chief Collection]]''.
File:HaloMovie Awakening Concept.jpg|Concept art of UNSC technicians outfitting a SPARTAN-II with the Mark V for the [[Halo film]].
File:Kelly MkV.png|[[Kelly-087]] wearing the Mark V armor during the [[Onyx Conflict]].
File:H3 MPSpartan ArmourConcept 4.jpg|Concept of the Mark V helmet for ''Halo 3'', alongside the [[EOD-class Mjolnir|EOD]] chest and shoulders.
File:H3 MjolnirMkVArmor Concept.jpg|A redux of the MJOLNIR Mark V as seen in the ''[[Art of Halo 3]]''.
File:HTMCC H3 MarkV Crop.png|A red Mark V-clad Spartan in ''Halo 3''.
File:HTMCC HR Spartan Mark V.png|A Mark V-clad Spartan-III in ''Halo: Reach''.
File:Reach E310 NobleSix.png|A full set of Mark V[B], the first version of the Mark V armor to enter service.
File:SpartanChief.png|The Spartan-IIs' initial MJOLNIR Mark V armor.
File:Clip image004.gif|All the armor permutations for the Mark V helmet in ''Halo: Reach''.
File:HR - Mark V Spartan with ODST.png|A Mark V-clad Spartan alongside an ODST on [[Installation 04 (map)|Installation 04]].
File:AnniversaryEarlyChief.png|The Mark V armor, seen in an early build of ''[[Halo: Combat Evolved Anniversary]]''.
File:Master chief anniversary.png|Another view of John-117's early Mark V armor in ''Halo: Combat Evolved Anniversary''. Note the FJ/PARA knee guards.
File:HCEA-MasterChiefMkV.png|The final version of the Mark V in ''Halo: Combat Evolved Anniversary''.
File:CEA-MarkV Render Front.png|Another image of the Mark V in ''Halo: Combat Evolved Anniversary''.
File:Hcex chief.jpg|Mesh used to make the Mark V in ''Halo: Combat Evolved Anniversary''.
File:HaloCEA MarkV Front.jpeg|Upperbody frontal of the Mark V in ''Halo: Combat Evolved Anniversary''.
File:2817467-gallery.jpg|The finalized version of the Mark V in ''Halo: Combat Evolved Anniversary''.
File:Mark V Avatar.jpg|The Mark V as an Avatar costume.
File:SPARTANTERMINAL.jpg|The Mark V in a ''Halo: Combat Evolved Anniversary'' terminal.
File:H4_MarkV_Concept.jpg|Concept art for the ''Halo 4'' GEN2 Mark V armor variant.
File:H4 Mark V Render.jpg|Renders of the ''Halo 4'' GEN2 Mark V variant.
File:MCC-H4 MarkVImpact.png|A Spartan-IV wearing GEN2 Mark V on [[Impact]].
File:HCEA-MCCCryomenu.jpg|John-117 wearing his Mark V in ''Halo: The Master Chief Collection''.
File:HTMCC Nameplate Revolver Alpha.png|A Mark V helmet nameplate in ''Halo: The Master Chief Collection''
File:Mark V parts.png|Broken internal Mark V parts in ''[[Halo 2: Anniversary]]''.
File:HM-JohnI04.png|John-117 in his Mark V in ''[[Halo Mythos]]''.
File:HLC Halo Conflict.png|John-117 wearing his Mark V on the ''[[Halo Legendary Crate]]'' #3 poster.
File:HFR John Render Front.png|A render of the Mark V in ''[[Halo: Fireteam Raven]]''.
File:HFR John Render.png|A render of the Mark V in ''Halo: Fireteam Raven''.
File:HINF WinterUpdateKeyartFull.jpg|A trio of Spartan-IVs in the Mark V(B) core featured in promo for ''[[Halo Infinite|Halo Infinite's]]'' [[Winter Update]], with one wearing the ''Halo: Reach'' Mark V helmet.
File:HINF Spartan MKV 1.jpg|Frontal view of a Spartan-IV wearing Mark V on the Mark V(B) core in ''Halo Infinite''.
File:HINF Spartan MKV 2.jpg|Profile view of a Spartan-IV wearing Mark V in ''Halo Infinite''.
File:HINF-CEMarkV.png|The ''Halo: Combat Evolved'' Mark V armor kit in ''Halo Infinite''.
File:HINF-CEMarkV2.jpg|A Spartan-IV wearing the ''Halo: Combat Evolved'' Mark V in ''Halo Infinite''.
File:HINF-CEMarkV3.jpg|A Spartan-IV wearing GEN1 Mark V.
File:HINF-MarkVandVI.jpg|A GEN3 Mark VI-clad Spartan-IV with a GEN1 Mark V-clad Spartan-IV on [[Forbidden]].
File:HINF-CEvsReachMkV.png|Comparison between the ''Combat Evolved'' Mark V kit and the ''Reach'' Mark V helmet and shoulders on the Mark V(B) core.
File:HINF-CEvsReachMkV1.png|Comparison focused on the shoulders.
File:HINF-CEvsReachMkV2.png|Comparison focused on the back.
</gallery>

==List of appearances==
*''[[Halo: The Fall of Reach]]'' {{1st}}
*''[[Halo: Combat Evolved]]''
*''[[Halo: The Flood]]''
*''[[Halo: First Strike]]''
*''[[Halo 2]]'' {{C|Various armor components}}
*''[[Halo Graphic Novel]]''
**''[[The Last Voyage of the Infinite Succor]]''
*''[[Halo: Ghosts of Onyx]]''
*''[[Halo 3]]''
*''[[Remember Reach]]
**''[[Birth of a Spartan]]''
**''[[Deliver Hope]]''
*''[[Halo: Reach]]''
*''[[Halo: Fall of Reach]]''
**''[[Halo: Fall of Reach - Invasion|Invasion]]''
*''[[Halo: Glasslands]]'' {{Mo}}
*''[[Halo: Combat Evolved Anniversary]]''
**''[[Terminal (Halo: Combat Evolved Anniversary)|Terminals]]''
*''[[Halo 4]]''
*''[[Halo 2: Anniversary]]'' {{C|Various armor components}}
**''[[Terminal (Halo 2: Anniversary)|Terminals]]''
*''[[Halo: Fleet Battles]]''
*''[[Halo 5: Guardians]]''
*''[[Halo Mythos]]''
*''[[Halo: Fractures]]''
**''[[Breaking Strain]]''
*''[[Halo: Envoy]]''
*''[[Halo: Fireteam Raven]]''
*''[[Halo: Official Spartan Field Manual]]''
*''[[Halo: Outpost Discovery]]''
*''[[Halo Infinite: Memory Agent]]'' {{Im}}
*''[[Halo Infinite]]''
*''[[Winter Contention]]''

==Notes==
{{Ref/Notes}}


==Sources==
{{Ref/Sources|2}}

{{Armor|Human}}
{{Armor/Permutation|H3|HR|H4|H5G|HI}}
{{Navbox/Universe/Mjolnir|Overview|GEN1|GEN2}}
[[Category:MJOLNIR armor]]
[[Category:Halo Infinite multiplayer armor permutations]]
[[Category:Halo 5: Guardians multiplayer armor permutations]]
[[Category:Halo 4 multiplayer armor permutations]]
[[Category:Halo: Reach multiplayer armor permutations]]
[[Category:Halo 3 multiplayer armor permutations]]