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[[File:Semi-Powered Infiltration.png|200px|thumb|right|A concept illustration of SPI armor from the ''[[Art of Halo 3]]''.]] | [[File:Semi-Powered Infiltration.png|200px|thumb|right|A concept illustration of SPI armor from the ''[[Art of Halo 3]]''.]] | ||
The '''Semi-Powered Infiltration armor''' ('''SPI armor''') is an | The '''Semi-Powered Infiltration armor''' ('''SPI armor''') is an [[armor]] system developed for use by the [[SPARTAN-III Program|SPARTAN-IIIs]]. | ||
==Overview== | ==Overview== | ||
Though more advanced than the [[Orbital Drop Shock Trooper]]s' [[ODST armor|body armor]], the SPI armor is far less advanced and powerful than the [[MJOLNIR Powered Assault Armor]] used by the [[SPARTAN-II Program|SPARTAN-IIs]]. Its main benefit is that it is drastically cheaper to produce than the MJOLNIR armor; the SPI armor was designed with an emphasis on stealth rather than on raw power. | Though more advanced than the [[Orbital Drop Shock Trooper]]s' [[ODST armor|body armor]], the SPI armor is far less advanced and powerful than the [[MJOLNIR Powered Assault Armor]] used by the [[SPARTAN-II Program|SPARTAN-IIs]]. Its main benefit is that it is drastically cheaper to produce than the MJOLNIR armor; the SPI armor was designed with an emphasis on stealth rather than on raw power. | ||
The armor features [[photoreactive panel|special photo-reactive panels]] that mimic the surrounding textures, effectively being the UNSC equivalent to the [[Covenant | The armor features [[photoreactive panel|special photo-reactive panels]] that mimic the surrounding textures, effectively being the UNSC equivalent to the [[Covenant]]'s [[active camouflage]] systems. It has been described as part "legionnaire mail, part tactical body armor, and part chameleon" by both [[Tom-B292]] and [[Catherine Halsey|Dr. Catherine Halsey]].<ref>'''Halo: Ghosts of Onyx''', ''page 16''</ref> | ||
==Versions== | ==Versions== | ||
===Mark I=== | ===Mark I=== | ||
The Mark I was used by the SPARTAN-IIIs of [[SPARTAN-III 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> It featured full body armor with an enclosed helmet and [[heads-up display]]. It was 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 | The Mark I was the first, experimental iteration of the SPI system used by the SPARTAN-IIIs of [[SPARTAN-III 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> It featured full body armor with an enclosed helmet and [[heads-up display]]. It was 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 a rough equivalent to active camouflage. The camouflage patterns, however, shifted irregularly and imperfectly, which made the photo-reactive panels inferior compared to the Covenant's active camouflage technologies. | ||
===Mark II=== | ===Mark II=== | ||
The Mark II was an improvement version of the SPI Mark I, first used by the drill instructors of [[SPARTAN-III Beta Company|Beta Company]], and then by the | The Mark II was an improvement version 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 Company. The armor sports new photo-reactive coating to boost their camouflaging properties. There were also numerous experimental refits to the ballistic gel layers, upgraded software suites, and other functions. Although the new photo-reactive coating could mimic a wide range of electromagnetic radiation, it was still sensitive to overload, so the wearer would still be vulnerable for several seconds after a flashbang or [[plasma]] hit while the panels reset.<ref>'''Halo: Ghosts of Onyx''', ''page 113''</ref> One minor improvement is that the armor is now hermetically sealed. | ||
The armor was proposed in [[2537]] for Alpha Company, but the request was denied because the armor was over budget. After Alpha Company's | The armor was proposed in [[2537]] for Alpha Company, but the request was denied because the armor was over budget. 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 SPI Armor Mark II. | ||
==Comparison to MJOLNIR== | ==Comparison to MJOLNIR== |