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| {{Era|GOO}}[[Image:SpartanIII.jpg|thumb|200px|Mark II SPI Armor]]'''Semi-Powered Infiltration Armor''', colloquially called "'''SPI Armor'''", was an [[armor]] system used by the [[United Nations Space Command]]. Though more advanced than the [[ODST]] [[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.<ref>[[Halo: Ghosts of Onyx]] page 16</ref>
| | #REDIRECT [[Semi-Powered Infiltration armor]] |
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| ==SPI Mark I==
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| The SPI armor Mark I was used by the Spartan-IIIs of [[Alpha Company|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>. The armor featured full body armor with a helmet and [[HUD]], and a supply of breathable atmosphere; though only enough for 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 patters however shifted irregularly and imperfectly, which made the photo-reactive panels unmatched against the Covenant elites Camouflage technologies. This was because the SPARTAN III program didn't allow enough time to get the photo-reactive panels working properly.
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| ==SPI Armor Mark II==
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| [[Image:SPI-FANART.jpg|300px|thumb|Fan Art of Spartan III with SPI Armor|right]]
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| The SPI armor Mark II was a more advanced version of the armor, 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 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 for example<ref>[[Halo: Ghosts of Onyx]] page 113</ref>.
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| 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.
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| After the augmentation of Gamma Company, small adjustments where installed into the SPI Armor Mark II.
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| ==Advantages==
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| #The armor is a lot cheaper and easier to mass-produce.
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| #It gave the SPARTAN-III's something the SPARTAN-II's didn't have, stealth.
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| #It could be transported easier, because it is not as thick or heavy as the MJOLNIR armor.
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| ==Disadvantages==
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| #Has no energy shield that the SPARTAN-III's require considering the amount of danger they face.
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| #Does not give the SPARTAN-III's the same amount of enhanced strenghth, speed and agility as the MJOLNIR does for SPARTAN-II's.
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| #After long use, tends to heat up and can become very uncomfortable.
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| #Since the AC plates take time to recover after explosions such as a flash bang grenade, the SPARTAN-III is visible until the plates recover.
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| ==Notes==
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| * 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]].
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| == Sources ==
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| <references/>
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| == Links ==
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| === Internal ===
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| *[[Halo: Ghosts of Onyx]]
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| === External ===
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| *[http://www.scifi-meshes.com/forums/3d-wips/15883-spi-armor-halo-universe.html SPI Modelling Thread (Sci-Fi Meshes.com)]
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| [[Category:UNSC]]
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| [[Category:Technology]]
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