The Mark IV Mjolnir Powered Assault Armor was the fourth of seven versions of the Mjolnir Powered Assault Armor. The suit was issued to SPARTAN-II commandos on November 27th, 2525, and was in service until November 24th, 2551, when it was replaced by the Mark V. John-117 was known to use the Mark IV until an unspecified later date due to him being in the field when the Mark V originally entered service.
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