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Mjolnir Powered Assault Armor/Pioneer, or just Pioneer armor, is a Mjolnir [GEN2] variant used by SPARTAN-IV personnel providing protection to ONI expeditionary groups. Manufactured by Acheron Security and tested at Gdynia, Acheron Fossae, Mars, Pioneer armor is constructed to endure the rigors of a potentially hostile, alien environment and to optimize overall performance through inhibitor mitigation. Pioneer armor was worn by SPARTAN-IV personnel on initial exploration efforts of Installation 03.
Both the base Pioneer armor and the ADEPT armor skin are unlocked by progressing through the PIONEER specialization in Halo 4.