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{{Era|GOO}}
{{Status|Canon}}
{{Ratings}}
{{Armor infobox
[[Image:SpartanIII.jpg|thumb|200px|Kurt Ambrose in his Mark-II SPI Armor]]
|name=Semi-Powered Infiltration armor
|image=[[File:HM-SPI-schematic.jpg|275px]]
|manufacturer=[[Watershed Division]]<ref name="HM">'''[[Halo Mythos]]''', ''pages 76-77''</ref>
|testsite=[[Currahee Special Assembly Plant 2]]{{Ref/Reuse|HM}}
|type=
|role=Stealth/assault
}}
The '''Semi-Powered Infiltration armor''' ('''SPI armor''') is a [[United Nations Space Command]] combat [[armor]] system designed with an emphasis on stealth through the use of [[Photoreactive panel|special photoreactive panels]].<ref name="goo14">'''[[Halo: Ghosts of Onyx]]''', ''page 14''</ref> The armor was developed by the [[Watershed Division]], with [[Ruk Ariaustin]] as design lead.{{Ref/Reuse|HM}}


The '''Semi-Powered Infiltration Armor''', colloquially called "'''SPI Armor'''", was an [[armor]] system used by the [[United Nations Space Command]] developed for the [[Spartan-III]]s. Though more advanced than the [[ODST]] Ballistic [[Body Suit]]s, it was far less advanced and less powerful than the [[MJOLNIR Armor]] used by the [[Spartan-II]]s. Its main benefit was that it was drastically cheaper to produce than the MJOLNIR armor. This armor was designed with an emphasis on stealth rather than raw power. It features [[Camouflage Cloak|special photo-reactive panels]] that mimic the surrounding textures, effectively being the UNSC equivalent to the [[Covenant]] [[Active Camouflage]] systems. It has been described as part legionnaire mail, part tactical body armor, and part chameleon by both [[Tom-B292]] and [[Dr. Halsey]].<ref>[[Halo: Ghosts of Onyx]] page 16</ref>  
== Overview ==
Described as "part legionnaire mail, part tactical body armor, and part chameleon", the SPI armor features [[photoreactive panel]]s that mimic the surrounding textures, effectively being the UNSC equivalent to the [[Covenant]]'s [[active camouflage]] systems.<ref>'''Halo: Ghosts of Onyx''', ''page 16''</ref> The SPI armor features a full body armor with an enclosed helmet and [[heads-up display]]. The undersuit is equipped with a cushioning layer of liquid nanocrystal that provides more ballistic protection than three centimeters of [[wikipedia:Kevlar|Kevlar]] diamond weave, without the bulk.<ref name="goo171">'''Halo: Ghosts of Onyx''', ''page 171''</ref> The hardened armor plates, though advanced compared to standard UNSC infantry armor, can take only a few glancing blows before failing.{{Ref/Reuse|goo14}}


== SPI Armor Mark I ==
Though more advanced than the [[Orbital Drop Shock Troopers]]' [[ODST armor|body armor]], the SPI armor is less powerful than the [[MJOLNIR Powered Assault Armor]] originally issued to the [[SPARTAN-II program|SPARTAN-II]]s.<ref>'''[[Halo: Glasslands]]''', ''page 207''</ref> Its main benefit is that it is drastically cheaper to produce than Mjolnir.<ref name="goo46">'''Halo: Ghosts of Onyx''', ''page 46''</ref> The cost reduction meant that dozens to hundreds of suits of SPI could be produced for the cost of a single suit of [[MJOLNIR Powered Assault Armor/Mark IV|Mark IV]].{{Ref/Site|Id=CFAA|URL=https://www.halowaypoint.com/en-us/news/anniversary-armory|Site=Halo Waypoint|Page=Canon Fodder - Anniversary Armory|D=24|M=02|Y=2024}} Although the SPI suit provides modest enhancements to the wearer's strength and mobility,{{Ref/Reuse|HM}} this amplification is not as drastic as that afforded by the Mjolnir.<ref>'''Halo: Last Light''', ''page 33'' (Google Play edition)</ref> Consequently, the SPI armor can be worn by any individual and does not require special neurological, skeletal or muscular [[Biological augmentation|augmentation]]; for example, the unaugmented instructors for the Spartan-IIIs often wore SPI armor.<ref>'''Halo: Ghosts of Onyx''', ''pages 89, 94''</ref>{{Ref/Reuse|g164}} The SPI armor is not as bulky or as heavy as the Mjolnir armor,<ref>'''Halo: Glasslands''', ''page 40''</ref> although the plating material is also less durable: [[Kelly-087]] dented a Spartan-III's chest plate with her fist when first encountering the Spartan-IIIs.<ref name="goo168">'''Halo: Ghosts of Onyx''', ''pages 168-169''</ref>
[[Image:1224258383_Spartans_never_die!.jpg|thumb|[[Kurt 051]] in his last seconds]]
The SPI armor Mark I, was used by the Spartan-IIIs of [[Alpha Company]]. It featured hardened plates and photo-reactive panels. Though advanced compared to standard UNSC infantry armor, it could only take a few glancing blows before failing<ref>[[Halo: Ghosts of Onyx]] page 14</ref>. It featured full body armor with an enclosed helmet and [[HUD]], and a supply of breathable atmosphere; though only enough for [[List of "Seven" references in Halo|7]] minutes, compared to the MJOLNIR armor’s endurance of 90 minutes. It is also equipped with a cushioning layer of liquid nanocrystals that provided more ballistic protection than three centimeters of [[wikipedia:Kevlar|Kevlar]] diamond weave without the bulk. The featured photo-reactive panels gave the Spartans of Alpha Company [[active camouflage]]. The camouflage patterns, however, shifted irregularly and imperfectly, which made the photo-reactive panels unmatched against the Covenant [[Elite]]s Camouflage technologies. This was because the SPARTAN III program probably didn't allow enough time, to get the photo-reactive panels working properly. Another concern was the budget spent in making the suits.
{{clear}}


== SPI Armor Mark II ==
The SPI armor generally lacks an [[energy shielding]] system, making the user far more vulnerable to enemy fire. However, the Spartan-III [[Headhunters]] wore experimental armor that was equipped with energy shields due to their elite nature and value. However, power must be drawn from the energy shields to recharge the suit's active camouflage module.<ref name="head212">'''[[Halo: Evolutions - Essential Tales of the Halo Universe]]''', "[[Headhunters]]", ''page 212''</ref>
The SPI armor Mark II was a more advanced version of the SPI Mark I, first used by the drill instructors of Beta Company and then by the Spartans of [[Beta Company]]. They had new photo-reactive coating to boost camouflaging properties. There were also numerous experimental refits to the gel ballistic layers, upgraded software suites, and other functions. Although the new photo-reactive coating could mimic a wide range of EM (Electro-Magnetic) radiation, it was still sensitive to overload, which is why it takes the suit a few moments to reset after a flash-bang or plasma hit for example<ref>[[Halo: Ghosts of Onyx]] page 113</ref>.


It was proposed in [[2537]] for Alpha Company, but the request was denied because the armor was over budget. After the "successful" operation of Alpha Company, the Mark II armor was approved for mass production. After the augmentation of [[Gamma Company]], small adjustments were installed into the SPI Armor Mark II.
The baseline SPI armor can be easily destroyed from plasma based weaponry, armor piercing rounds and other threats. Overall the armor has inferior protection than [[Mjolnir armor]], forcing the user to rely heavily on its stealth technology and superior tactics.{{Citation needed}}


== Advantages vs. MJOLNIR Armor ==
==Operational history==
#The armor is significantly cheaper and easier to mass-produce.
Early versions of the Semi-Powered Infiltration armor were developed by [[ONI Section Three]] around the beginning of the [[Human-Covenant War]] for use by ONI agents. A facility dedicated to testing the armor was constructed underground at the future site of the [[Avery J. Johnson Academy of Military Science]].{{Ref/Game|HINF|Site Unseen}}
#Includes [[Camouflage Cloak|special photo-reactive panels]] that act as an active camouflage for the wearer.
#It could be transported easily, because it is not as thick or heavy as the MJOLNIR armor.
#It is more flexible to move by will of the wearer.
#The armor requires less physical enhancements compared to the MJOLNIR armor making it more versatile to other would-be users.


== Disadvantages vs. MJOLNIR Armor ==
Although early versions of the SPI system were tested by [[Orbital Drop Shock Troopers]],<ref name="g164">'''Halo: Ghosts of Onyx''', ''page 164''</ref> the armor was most prominently issued to the [[Spartan-III]] supersoldiers.{{Ref/Reuse|goo14}} With over 2,000 units of SPI armor manufactured during the [[Human-Covenant War]],{{Ref/Reuse|HM}} the SPI armor had been mostly phased out of use by Spartan-IIIs by [[2558]] in favor of Mjolnir.{{Ref/Site|Id=CF50|URL=https://www.halowaypoint.com/en-us/news/canon-fodder-fifty-caliber|Site=Halo Waypoint|Page=Canon Fodder - Fifty Caliber|D=10|M=03|Y=2019}} However, SPI continues to fill a usage niche in covert roles, particularly within ONI; the Spartan-IIIs in [[Veta Lopis]]' [[Ferret]] team often used SPI instead of Mjolnir due to the former's superior stealth capabilities.<ref>''Halo: Retribution'', Chapter 18</ref><ref>[https://twitter.com/TDenningauthor/status/912699859924393984 '''Twitter''': ''Troy Denning status update #912699859924393984'']</ref> The SPI armor has also been issued to non-Spartan personnel, such as Veta Lopis, whose suit was custom-built to fit her small frame.<ref>[https://twitter.com/TDenningauthor/status/879779858393440256 '''Twitter''': ''Troy Denning status update #879779858393440256'']</ref> [[SPARTAN-G059]], deployed as an ONI assassin, used SPI as late as 2558.<ref>'''[[Halo: Tales from Slipspace]]''', ''[[Knight Takes Bishop]]''</ref> As well, the photoreactive plating technology has seen limited but successful use in several special operations ODST units.{{Ref/Reuse|CF50}}
#Has no energy shield that the SPARTAN-IIIs required, considering the amount of danger the Spartan-IIIs face.
#Does not give the SPARTAN-IIIs the same amount of enhanced strength, speed, and agility as the MJOLNIR does for SPARTAN-IIs.
#It stresses more teamwork on the Teams to take down enemy threats.  
#Since the AC plates take time to recover, after explosions such as a flash bang grenade and plasma hits, the SPARTAN-III is visible until the plates recover.
#Is made of a less dense alloy than MJOLNIR armor as [[Kelly-087]] managed to dent [[Holly]]'s chest plate with her fist on the planet [[Onyx]].
#The SPI armor does not dispel water unlike MJOLNIR Mk V & VI armor.
#The SPI can not be used for long periods of time without the cooling system failing.  


== Notes ==
== Versions ==
[[Image:SPI.jpg|thumb|right|140px|SPI armor in [[The Art of Halo 3]]]]
=== Mark I ===
*Some screenshots released by Bungie lead to fans speculating that they would be able to use SPI armor in [[Halo 3]]. However, the armor was later determined to be [[Mark VI MJOLNIR Powered Assault Armor/V variant]]. The name and changes in appearance are purely cosmetic, however, having no impact on gameplay. This has been confirmed by [[Bungie]].
The Mark I was an experimental iteration of the SPI system used by the Spartan-IIIs of [[SPARTAN-III Alpha Company|Alpha Company]]. The featured photoreactive panels gave the Spartans of Alpha Company a rough equivalent to active camouflage. The camouflage patterns, however, shifted irregularly and imperfectly, which made the photoreactive panels inferior compared to the [[Covenant]]'s active camouflage technologies.<ref>'''Halo: Ghosts of Onyx''', ''page 85''</ref>
*For all intents and purposes, SPI armor is simply a less-powerful version of MJOLNIR armor. It was meant to give the wearer maximum protection at the minimum cost, so many of the original armor features (for example, shields) were left out.
* The [[SPI]] helmet looks interestingly like the EVA ([[Mark VI MJOLNIR Powered Assault Armor/V variant]]) Armor Permutation.


==Sources==
=== Mark II ===
<references/>
The Mark II was an improvement of the SPI Mark I, first used by the drill instructors of [[SPARTAN-III Beta Company|Beta Company]], and then by the Spartans of Beta and Gamma Companies.<ref name="goo89">'''Halo: Ghosts of Onyx''', ''page 89''</ref> The armor sports new photoreactive coating to boost its camouflaging capabilities. Although the new photoreactive coating can mimic a wide range of electromagnetic radiation, it is still sensitive to overload, making the wearer vulnerable for several seconds after a [[flashbang]] or [[plasma]] shots from plasma weaponry or any directed energy weapon hit while the panels reset.<ref name="goo113">'''Halo: Ghosts of Onyx''', ''page 113''</ref> Originally, the suits were not watertight,<ref name="GoOCP">'''Halo: Ghosts of Onyx''', Chapter Prologue</ref> but by 2552 they had been upgraded to resist submersion with their own [[oxygen]] supply.<ref name="GoOC28">'''Halo: Ghosts of Onyx''', Chapter 28, page 251</ref>  


== Links ==
The armor was proposed by [[Kurt Ambrose]] in [[2537]] for Alpha Company, but the request was denied because the armor was over budget.<ref>'''Halo: Ghosts of Onyx''', ''page 80''</ref> After Alpha Company's Pyrrhic victory in [[Operation: PROMETHEUS]], the Mark II was approved for mass production. After the augmentation of [[SPARTAN-III Gamma Company|Gamma Company]], small adjustments were installed into the Mark II SPI armor,{{Ref/Reuse|goo99}} including experimental refits to the ballistic gel layers, upgraded software suites, and other functions, slated to be introduced to the systems prior to Gamma Company's deployment in [[2552]].<ref name="goo99">'''Halo: Ghosts of Onyx''', ''page 99''</ref>
=== Internal ===
*[[Halo: Ghosts of Onyx]]


=== External ===
==Mainline armor components==
*[http://www.scifi-meshes.com/forums/3d-wips/15883-spi-armor-halo-universe.html SPI Modelling Thread (Sci-Fi Meshes.com)]
;MIRAGE-class helmet<ref name="mythos">'''[[Halo Mythos]]''', ''page 77''</ref>: The standard headgear of the SPI armor, the [[MIRAGE-class helmet]] features a large, bulbous faceplate somewhat similar to that of the [[MJOLNIR Powered Assault Armor/V variant|Mjolnir EVA variant]]. The visor is normally gold-mirrored in color<ref name="goo115">'''Halo: Ghosts of Onyx''', ''page 115''</ref> and can be depolarized.{{Ref/Reuse|goo168}} The helmet supports a [[heads-up display]] with features similar to that of the MJOLNIR system, including TACMAP, TEAMBIO, and [[COM|TEAMCOM]] interfaces; a [[motion tracker]];<ref>'''Halo: Last Light''', ''page 146'' (Google Play edition)</ref> as well as team status lights.<ref>'''Halo: Ghosts of Onyx''', ''pages 17, 22''</ref><ref name="g114">'''Halo: Ghosts of Onyx''', ''page 114''</ref> The visor suite features an automatic magnification and image enhancement system controlled by the wearer's eye movements. For example, if the wearer squints while looking at a particular spot the system will automatically zoom in.<ref>'''Halo: Ghosts of Onyx''', ''page 19''</ref> Both the image enhancement and the visor's internal polarization can also be controlled manually.<ref>'''Halo: Ghosts of Onyx''', ''page 268''</ref><ref>'''Halo: Ghosts of Onyx''', ''page 345''</ref> The helmet possesses tactical lights<ref>'''Halo: Ghosts of Onyx''', ''page 273''</ref> and a defogging vent to remove internal moisture.<ref>'''Halo: Ghosts of Onyx''', ''page 316''</ref>


[[Category:UNSC]]
;Techsuit: The bodysuit of the SPI system is composed of a layered mesh of ballistic liquid nanocrystal that is significantly more effective than traditional body armor materials such as Kevlar while being less bulky.{{Ref/Reuse|goo171}}{{Ref/Reuse|g114}}<ref>'''Halo: Ghosts of Onyx''', ''page 360''</ref> The techsuit's leggings<ref name="g141">'''Halo: Ghosts of Onyx''', ''page 141''</ref> and sleeves can be removed independently.<ref>'''Halo: Last Light''', ''page 125'' (Google Play edition)</ref>
[[Category:Technology]]
 
;Photoreactive panels: The outer shell of the SPI armor comprises a series of lightweight laminate plates with a photoreactive coating.{{Ref/Reuse|HM}} The photoreactive panels act as [[active camouflage]] when active,<ref>'''Halo: Ghosts of Onyx''', ''page 165''</ref> effectively blending the wearer with their environment.{{Ref/Reuse|goo14}} The coating also renders the wearer nearly invisible to infrared and passive light-gathering systems.<ref>'''Halo: Last Light''', ''page 95'' (Google Play edition)</ref> Since the photoreactive plates take time to recover after explosions such as a [[flashbang grenade]] and [[Plasma weaponry|plasma]] hits, the wearer is visible until the plates recover.{{Ref/Reuse|goo113}} With the exception of the [[Headhunters]]' suits, the SPI armor does not feature energy field-based active camouflage systems like those of the Covenant.{{Ref/Reuse|head212}} When inert, the plating is matte gray{{Ref/Reuse|mythos}}{{Ref/Reuse|g141}} or green, though some SPI suits have been known to use different colors such as red.<ref>'''Headhunters''' ''motion comic''</ref><ref>'''Halo Mythos''', ''page 135''</ref>
 
;Rift-class gauntlets: The SPI suit is equipped with shock-resistant and force-amplifying [[Rift-class gauntlets]].{{Ref/Reuse|HM}}
 
;Tactile bracers: The bracer armor pieces around the boots grant slight improvements to speed and dexterity with negligible shielding reduction.{{Ref/Reuse|HM}}
 
;Environmental controls: The suit possesses rudimentary environmental regulation system to maintain a comfortable temperature for the wearer.<ref>'''Halo: Ghosts of Onyx''', ''page 22''</ref> However, the system is not designed for extended use and it will become increasingly uncomfortable to wear if used continuously over long periods of time.<ref>'''Halo: Ghosts of Onyx''', ''page 254''</ref> The armor also has an efficient cooling system and is significantly difficult to detect even with thermal scanners.{{Ref/Reuse|goo89}}
 
;Biofoam injection ports: Like MJOLNIR, the SPI armor has dedicated ports allowing the quick injection of [[biofoam]] or other battlefield pharmaceuticals.<ref>'''Halo: Ghosts of Onyx''', ''page 362''</ref>
 
;Data socket: The SPI armor's gauntlet features a data port to which small electronic devices such as [[data pad]]s can be connected.<ref>'''Halo: Ghosts of Onyx''', ''page 310''</ref><ref>'''Halo: Ghosts of Onyx''', ''page 356''</ref>
 
;Power cell: The armor is powered by a low-profile, shielded [[BA-55901/PLMD]] battery cell.{{Ref/Reuse|mythos}}
 
==Variants==
In addition to the standard model, several variants of the SPI armor exist.{{Ref/Note|Similar to the somewhat differing depictions of [[Mjolnir armor]], the exact design details of the "default" SPI armor vary between different sources of ''Halo'' canon, sometimes within a single source. Since it is difficult to determine which of these examples constitute officially-defined variants of the suit rather than artistic license, only the versions that overtly deviate from the standard pattern are listed below, while the gallery section provides examples of less pronounced variety between SPI suits.}}
 
===Air Assault-like===
This variant has a [[STALKER-class Mjolnir|Stalker]]-like suit, with a helmet that is similar in design to [[AIR ASSAULT-class Mjolnir|Air Assault]]. It was utilized by [[Roland-B210]] and equipped with motion trackers, energy shielding, VISR, and a prototype active camouflage.
<gallery>
File:Roland SPI 2.png|Air Assault-like.
</gallery>
 
===Pilot-like===
This variant has a helmet design that is similar to [[PILOT-class Mjolnir|Pilot]]. A Spartan-III wearing this variant was stuck in Onyx between 2552 and 2553.
<gallery>
File:Mythos SPI red version.jpg|Pilot-like helmet.
</gallery>
 
===Grenadier-like===
This variant has a helmet design that is similar to [[GRENADIER-class Mjolnir|Grenadier]]. [[Mark-G313]] wore this suit during [[Operation: JOVIAN WHISTLE]].{{Ref/Note|In [[:File:Halo Last Light cover.jpg|the cover]] of ''Halo: Last Light'', Mark (who is seen in the background of the image) is depicted as wearing a standard set of SPI armor.}}
<gallery>
File:Marksniper.png|Grenadier-like.
File:Enc22 MarkG313.jpg|The suit.
</gallery>
 
===Mirage===
{{Main|MIRAGE-class Mjolnir}}
This variant is a modified SPI armor and compatible with the [[MJOLNIR Powered Assault Armor]] [[MJOLNIR Powered Assault Armor/Mark VI|Mark VI]]. It incorporates the latest in software-definable deception jammers, and the forearms are a further refinement of the RIFT-class force-amplification gauntlets found on the standard SPI armor.
<gallery>
File:HTMCC Mirage Armour.jpg|MIRAGE-class Mjolnir
</gallery>
 
==Non-canon and dubious canon appearances==
[[File:HTVS2 - KaiWithSPIRegiment.png|thumb|right|250px|SPI-clad SPARTAN-IIIs in front of [[Kai-125/Silver|Kai-125]].]]
===Silver Timeline===
{{Notice/Silver|category=no}}
{{Quote|Nice suit.|[[John-117/Silver|John-117]] commenting on [[Talia Perez]]'s SPI armor.{{Ref/Film|Id=Thermopylae|TV|Episode=[[Thermopylae (TV Series)|Thermopylae]]}}}}
{{Expand-section}}
{{Clear}}
 
==Production note==
{{Linkbox|gallery=yes|gallerypage=Images of SPI Armor}}
The SPI armor is referred to as "PR" twice in ''Halo: Ghosts of Onyx''.<ref>'''Halo: Ghosts of Onyx''', ''page 87'' (''"...the flaws in their Mark-I PR suits..."'')</ref><ref>'''Halo: Ghosts of Onyx''', ''page 141'' (''"...and pulled on the PR leggings."'')</ref> No context or explanation is provided for this alternate designation, although it is possible that the suit was known as "PR" (possibly an acronym for "PhotoReactive") in an earlier revision of the novel's manuscript and that the presence of the two mentions in the final book is an editing oversight.
 
== Gallery ==
<gallery>
File:HGOO Kurt Crop.jpg|Kurt-051 wearing SPI armor in ''[[Halo: Ghosts of Onyx]]''.
File:Semi-Powered Infiltration.png|A conceptual illustration of the SPI armor.
File:H3 Guardian Mirage AR.png|A [[Spartan-II]] clad in [[MIRAGE-class Mjolnir]] in the ''[[Halo 3]]'' portion of ''[[Halo: The Master Chief Collection]]''.
File:Headhunters.png|Two Headhunters, [[Roland-B210]] and [[Jonah-B283]], wearing SPI armor in ''[[Headhunters (story)|Headhunters]]''.
File:Spivariant.jpg|Another view of Roland's and Jonah's SPI armor.
File:HEvol - SPI HUD.png|An energy shielded SPI suit's [[Heads-up display|HUD]]. Note the HUD's resemblance to that of the [[MJOLNIR Powered Assault Armor/Mark V|MJOLNIR Mark V]].
File:Headhunter SPI Armor.jpg|[[Jonah-B283]] wearing his SPI armor.
File:Headhunters - Jonah profile.png|Renders of Jonah's SPI armor.
File:Evo Headhunters Post.jpg|Officially endorsed fan art of Jonah and Roland wearing modified SPI armor.
File:HLL cover-Olivia full.png|[[Olivia-G291]] in SPI armor with her helmet removed in ''[[Halo: Last Light]]''.
File:HM-SIIIs.png|MIRAGE-class helmet with an eagle emblem on the visor in ''[[Halo Mythos]]''.
File:HM EVA-like SPI.png|EVA-like helmet stylized SPI.
File:TfS - SPARTAN-G059.png|[[SPARTAN-G059]] clad in SPI armor in ''[[Knight Takes Bishop]]''.
File:Veta SPI.png|[[Veta Lopis]] equipped with SPI armor in ''[[Halo: Retribution]]''.
File:HINF Mirage IIC Core Icon.png|The Mirage IIC core in ''[[Halo Infinite]]''.
File:Enc22 Kurt with helmet.jpg|Image of Kurt Ambrose clad in SPI from the ''[[Halo Encyclopedia (2022 edition)|Halo Encyclopedia]]''.
File:Enc22 SPI.png|An image of SPI armor in the ''Halo Encyclopedia''.
File:HTVS2-SpartansinSPI.jpg|SPI-clad Spartan-IIIs in ''[[Halo: The Television Series Season Two]]''.
</gallery>
 
== List of appearances ==
*''[[Halo: Ghosts of Onyx]]'' {{1st}}
*''[[Halo 3]]'' {{C|''Halo: The Master Chief Collection'' only}}
*''[[Halo: Evolutions]]''
**''[[Headhunters (short story)|Headhunters]]''
*''[[Halo: Reach]]'' {{Mo}}
*''[[Halo: Glasslands]]''
*''[[Halo: Last Light]]''
*''[[Halo Mythos]]''
*''[[Halo: Tales from Slipspace]]''
**''[[Knight Takes Bishop]]''
*''[[Halo: Retribution]]''
*''[[Halo: Official Spartan Field Manual]]''
*''[[Halo: Divine Wind]]'' {{Mo}}
*''[[Halo Infinite]]''
**''[[Season 03: Echoes Within]]''
*''[[Halo: The Television Series Season Two]]''
**''[[Aleria (TV Series)|Aleria]]''
**''[[Onyx (TV Series)|Onyx]]''
**''[[Thermopylae (TV Series)|Thermopylae]]''
**''[[Halo (TV Series)|Halo]]''
 
==Notes==
{{Ref/Notes}}
 
== Sources ==
{{Ref/Sources|2}}
 
{{Armor|Human}}
[[Category:Armor]]

Latest revision as of 18:38, August 26, 2024

Semi-Powered Infiltration armor
HM-SPI-schematic.jpg
Production overview

Manufacturer(s):

Watershed Division[1]

Testing site(s):

Currahee Special Assembly Plant 2[1]

Role(s):

Stealth/assault

 

The Semi-Powered Infiltration armor (SPI armor) is a United Nations Space Command combat armor system designed with an emphasis on stealth through the use of special photoreactive panels.[2] The armor was developed by the Watershed Division, with Ruk Ariaustin as design lead.[1]

Overview[edit]

Described as "part legionnaire mail, part tactical body armor, and part chameleon", the SPI armor features photoreactive panels that mimic the surrounding textures, effectively being the UNSC equivalent to the Covenant's active camouflage systems.[3] The SPI armor features a full body armor with an enclosed helmet and heads-up display. The undersuit is equipped with a cushioning layer of liquid nanocrystal that provides more ballistic protection than three centimeters of Kevlar diamond weave, without the bulk.[4] The hardened armor plates, though advanced compared to standard UNSC infantry armor, can take only a few glancing blows before failing.[2]

Though more advanced than the Orbital Drop Shock Troopers' body armor, the SPI armor is less powerful than the MJOLNIR Powered Assault Armor originally issued to the SPARTAN-IIs.[5] Its main benefit is that it is drastically cheaper to produce than Mjolnir.[6] The cost reduction meant that dozens to hundreds of suits of SPI could be produced for the cost of a single suit of Mark IV.[7] Although the SPI suit provides modest enhancements to the wearer's strength and mobility,[1] this amplification is not as drastic as that afforded by the Mjolnir.[8] Consequently, the SPI armor can be worn by any individual and does not require special neurological, skeletal or muscular augmentation; for example, the unaugmented instructors for the Spartan-IIIs often wore SPI armor.[9][10] The SPI armor is not as bulky or as heavy as the Mjolnir armor,[11] although the plating material is also less durable: Kelly-087 dented a Spartan-III's chest plate with her fist when first encountering the Spartan-IIIs.[12]

The SPI armor generally lacks an energy shielding system, making the user far more vulnerable to enemy fire. However, the Spartan-III Headhunters wore experimental armor that was equipped with energy shields due to their elite nature and value. However, power must be drawn from the energy shields to recharge the suit's active camouflage module.[13]

The baseline SPI armor can be easily destroyed from plasma based weaponry, armor piercing rounds and other threats. Overall the armor has inferior protection than Mjolnir armor, forcing the user to rely heavily on its stealth technology and superior tactics.[citation needed]

Operational history[edit]

Early versions of the Semi-Powered Infiltration armor were developed by ONI Section Three around the beginning of the Human-Covenant War for use by ONI agents. A facility dedicated to testing the armor was constructed underground at the future site of the Avery J. Johnson Academy of Military Science.[14]

Although early versions of the SPI system were tested by Orbital Drop Shock Troopers,[10] the armor was most prominently issued to the Spartan-III supersoldiers.[2] With over 2,000 units of SPI armor manufactured during the Human-Covenant War,[1] the SPI armor had been mostly phased out of use by Spartan-IIIs by 2558 in favor of Mjolnir.[15] However, SPI continues to fill a usage niche in covert roles, particularly within ONI; the Spartan-IIIs in Veta Lopis' Ferret team often used SPI instead of Mjolnir due to the former's superior stealth capabilities.[16][17] The SPI armor has also been issued to non-Spartan personnel, such as Veta Lopis, whose suit was custom-built to fit her small frame.[18] SPARTAN-G059, deployed as an ONI assassin, used SPI as late as 2558.[19] As well, the photoreactive plating technology has seen limited but successful use in several special operations ODST units.[15]

Versions[edit]

Mark I[edit]

The Mark I was an experimental iteration of the SPI system used by the Spartan-IIIs of Alpha Company. The featured photoreactive panels gave the Spartans of Alpha Company a rough equivalent to active camouflage. The camouflage patterns, however, shifted irregularly and imperfectly, which made the photoreactive panels inferior compared to the Covenant's active camouflage technologies.[20]

Mark II[edit]

The Mark II was an improvement of the SPI Mark I, first used by the drill instructors of Beta Company, and then by the Spartans of Beta and Gamma Companies.[21] The armor sports new photoreactive coating to boost its camouflaging capabilities. Although the new photoreactive coating can mimic a wide range of electromagnetic radiation, it is still sensitive to overload, making the wearer vulnerable for several seconds after a flashbang or plasma shots from plasma weaponry or any directed energy weapon hit while the panels reset.[22] Originally, the suits were not watertight,[23] but by 2552 they had been upgraded to resist submersion with their own oxygen supply.[24]

The armor was proposed by Kurt Ambrose in 2537 for Alpha Company, but the request was denied because the armor was over budget.[25] After Alpha Company's Pyrrhic victory in Operation: PROMETHEUS, the Mark II was approved for mass production. After the augmentation of Gamma Company, small adjustments were installed into the Mark II SPI armor,[26] including experimental refits to the ballistic gel layers, upgraded software suites, and other functions, slated to be introduced to the systems prior to Gamma Company's deployment in 2552.[26]

Mainline armor components[edit]

MIRAGE-class helmet[27]
The standard headgear of the SPI armor, the MIRAGE-class helmet features a large, bulbous faceplate somewhat similar to that of the Mjolnir EVA variant. The visor is normally gold-mirrored in color[28] and can be depolarized.[12] The helmet supports a heads-up display with features similar to that of the MJOLNIR system, including TACMAP, TEAMBIO, and TEAMCOM interfaces; a motion tracker;[29] as well as team status lights.[30][31] The visor suite features an automatic magnification and image enhancement system controlled by the wearer's eye movements. For example, if the wearer squints while looking at a particular spot the system will automatically zoom in.[32] Both the image enhancement and the visor's internal polarization can also be controlled manually.[33][34] The helmet possesses tactical lights[35] and a defogging vent to remove internal moisture.[36]
Techsuit
The bodysuit of the SPI system is composed of a layered mesh of ballistic liquid nanocrystal that is significantly more effective than traditional body armor materials such as Kevlar while being less bulky.[4][31][37] The techsuit's leggings[38] and sleeves can be removed independently.[39]
Photoreactive panels
The outer shell of the SPI armor comprises a series of lightweight laminate plates with a photoreactive coating.[1] The photoreactive panels act as active camouflage when active,[40] effectively blending the wearer with their environment.[2] The coating also renders the wearer nearly invisible to infrared and passive light-gathering systems.[41] Since the photoreactive plates take time to recover after explosions such as a flashbang grenade and plasma hits, the wearer is visible until the plates recover.[22] With the exception of the Headhunters' suits, the SPI armor does not feature energy field-based active camouflage systems like those of the Covenant.[13] When inert, the plating is matte gray[27][38] or green, though some SPI suits have been known to use different colors such as red.[42][43]
Rift-class gauntlets
The SPI suit is equipped with shock-resistant and force-amplifying Rift-class gauntlets.[1]
Tactile bracers
The bracer armor pieces around the boots grant slight improvements to speed and dexterity with negligible shielding reduction.[1]
Environmental controls
The suit possesses rudimentary environmental regulation system to maintain a comfortable temperature for the wearer.[44] However, the system is not designed for extended use and it will become increasingly uncomfortable to wear if used continuously over long periods of time.[45] The armor also has an efficient cooling system and is significantly difficult to detect even with thermal scanners.[21]
Biofoam injection ports
Like MJOLNIR, the SPI armor has dedicated ports allowing the quick injection of biofoam or other battlefield pharmaceuticals.[46]
Data socket
The SPI armor's gauntlet features a data port to which small electronic devices such as data pads can be connected.[47][48]
Power cell
The armor is powered by a low-profile, shielded BA-55901/PLMD battery cell.[27]

Variants[edit]

In addition to the standard model, several variants of the SPI armor exist.[Note 1]

Air Assault-like[edit]

This variant has a Stalker-like suit, with a helmet that is similar in design to Air Assault. It was utilized by Roland-B210 and equipped with motion trackers, energy shielding, VISR, and a prototype active camouflage.

  • Air Assault-like.

    Air Assault-like.

Pilot-like[edit]

This variant has a helmet design that is similar to Pilot. A Spartan-III wearing this variant was stuck in Onyx between 2552 and 2553.

  • Pilot-like helmet.

    Pilot-like helmet.

Grenadier-like[edit]

This variant has a helmet design that is similar to Grenadier. Mark-G313 wore this suit during Operation: JOVIAN WHISTLE.[Note 2]

  • Grenadier-like.

    Grenadier-like.

  • The suit.

    The suit.

Mirage[edit]

Main article: MIRAGE-class Mjolnir

This variant is a modified SPI armor and compatible with the MJOLNIR Powered Assault Armor Mark VI. It incorporates the latest in software-definable deception jammers, and the forearms are a further refinement of the RIFT-class force-amplification gauntlets found on the standard SPI armor.

  • MIRAGE-class Mjolnir

    MIRAGE-class Mjolnir

Non-canon and dubious canon appearances[edit]

Kai-125 with Semi-Powered Infiltration armor-clad soldiers.
SPI-clad SPARTAN-IIIs in front of Kai-125.

Silver Timeline[edit]

HTV-SilverTeam logo.png
 This article contains information about the Silver Timeline, and is not a part of the established Halo canon.

"Nice suit."
— John-117 commenting on Talia Perez's SPI armor.[49]
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Production note[edit]

Main-Superintendent.png Browse more images in this article's gallery page.

The SPI armor is referred to as "PR" twice in Halo: Ghosts of Onyx.[50][51] No context or explanation is provided for this alternate designation, although it is possible that the suit was known as "PR" (possibly an acronym for "PhotoReactive") in an earlier revision of the novel's manuscript and that the presence of the two mentions in the final book is an editing oversight.

Gallery[edit]

List of appearances[edit]

Notes[edit]

  1. ^ Similar to the somewhat differing depictions of Mjolnir armor, the exact design details of the "default" SPI armor vary between different sources of Halo canon, sometimes within a single source. Since it is difficult to determine which of these examples constitute officially-defined variants of the suit rather than artistic license, only the versions that overtly deviate from the standard pattern are listed below, while the gallery section provides examples of less pronounced variety between SPI suits.
  2. ^ In the cover of Halo: Last Light, Mark (who is seen in the background of the image) is depicted as wearing a standard set of SPI armor.

Sources[edit]

  1. ^ a b c d e f g h Halo Mythos, pages 76-77
  2. ^ a b c d Halo: Ghosts of Onyx, page 14
  3. ^ Halo: Ghosts of Onyx, page 16
  4. ^ a b Halo: Ghosts of Onyx, page 171
  5. ^ Halo: Glasslands, page 207
  6. ^ Halo: Ghosts of Onyx, page 46
  7. ^ Halo Waypoint, Canon Fodder - Anniversary Armory (Retrieved on Feb 24, 2024) [archive]
  8. ^ Halo: Last Light, page 33 (Google Play edition)
  9. ^ Halo: Ghosts of Onyx, pages 89, 94
  10. ^ a b Halo: Ghosts of Onyx, page 164
  11. ^ Halo: Glasslands, page 40
  12. ^ a b Halo: Ghosts of Onyx, pages 168-169
  13. ^ a b Halo: Evolutions - Essential Tales of the Halo Universe, "Headhunters", page 212
  14. ^ Halo Infinite, Site Unseen
  15. ^ a b Halo Waypoint, Canon Fodder - Fifty Caliber (Retrieved on Mar 10, 2019) [archive]
  16. ^ Halo: Retribution, Chapter 18
  17. ^ Twitter: Troy Denning status update #912699859924393984
  18. ^ Twitter: Troy Denning status update #879779858393440256
  19. ^ Halo: Tales from Slipspace, Knight Takes Bishop
  20. ^ Halo: Ghosts of Onyx, page 85
  21. ^ a b Halo: Ghosts of Onyx, page 89
  22. ^ a b Halo: Ghosts of Onyx, page 113
  23. ^ Halo: Ghosts of Onyx, Chapter Prologue
  24. ^ Halo: Ghosts of Onyx, Chapter 28, page 251
  25. ^ Halo: Ghosts of Onyx, page 80
  26. ^ a b Halo: Ghosts of Onyx, page 99
  27. ^ a b c Halo Mythos, page 77
  28. ^ Halo: Ghosts of Onyx, page 115
  29. ^ Halo: Last Light, page 146 (Google Play edition)
  30. ^ Halo: Ghosts of Onyx, pages 17, 22
  31. ^ a b Halo: Ghosts of Onyx, page 114
  32. ^ Halo: Ghosts of Onyx, page 19
  33. ^ Halo: Ghosts of Onyx, page 268
  34. ^ Halo: Ghosts of Onyx, page 345
  35. ^ Halo: Ghosts of Onyx, page 273
  36. ^ Halo: Ghosts of Onyx, page 316
  37. ^ Halo: Ghosts of Onyx, page 360
  38. ^ a b Halo: Ghosts of Onyx, page 141
  39. ^ Halo: Last Light, page 125 (Google Play edition)
  40. ^ Halo: Ghosts of Onyx, page 165
  41. ^ Halo: Last Light, page 95 (Google Play edition)
  42. ^ Headhunters motion comic
  43. ^ Halo Mythos, page 135
  44. ^ Halo: Ghosts of Onyx, page 22
  45. ^ Halo: Ghosts of Onyx, page 254
  46. ^ Halo: Ghosts of Onyx, page 362
  47. ^ Halo: Ghosts of Onyx, page 310
  48. ^ Halo: Ghosts of Onyx, page 356
  49. ^ Halo: The Television Series, episode Thermopylae
  50. ^ Halo: Ghosts of Onyx, page 87 ("...the flaws in their Mark-I PR suits...")
  51. ^ Halo: Ghosts of Onyx, page 141 ("...and pulled on the PR leggings.")

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