“Some operations are considered hazardous even for a fully armored Spartan
— Description of the HAZOP helmet.
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The Mjolnir Powered Assault Armor/HAZOP (Hazardous Operations), is a variant of the Mark V Mjolnir Powered Assault Armor.[1]

Halo: ReachEdit

There are three variants of the HAZOP helmet in Halo: Reach. These variants include the base model, costing 7,000 cR, a helmet with the CBRN/HUL attachment that costs 2,000 cR, and a helmet with the CNM-I attachment that costs 1,000 cR. The HAZOP armor also includes shoulder pieces, which costs 500 cR each.[2]

Halo 4Edit

The HAZOP helmet returns in Halo 4 for Spartan IVs to use during combat simulations aboard the UNSC Infinity. The Halo 4 Limited Edition includes several skins such as forest camo for the HAZOP armor system. The Forest skin can also be obtained by pre-ordering the game from Gamestop.

[GEN2] HAZOP armor is manufactured by Acheron Security.[3]


  • The Halo 4 HAZOP helmet looks radically different from its Reach with a T-shaped visor and protrusions on the chin like the EOD helmet.



  1. Halo: Waypoint: First Look: Halo: Reach Actions Figures!
  2. IGN Video: Halo: Reach Xbox 360 Video - The Armory Video
  3. Halo Waypoint - Halo 4 Intel - Armor: HAZOP