MJOLNIR Powered Assault Armor/CIO

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H4 MJOLNIR Counter Intelligence Operator.png
Production overview


Acheron Security

Testing site(s):

Gdynia, Acheron Fossae on Mars




Counter intelligence

Technical specifications
Designed for counter-intelligence operability in the Martian territory of Acheron Fossae.

The MJOLNIR Powered Assault Armor/CIO (Counter Intelligence Operator)[1] is a variant of the MJOLNIR Powered Assault Armor [GEN2].

Development history[edit]

The MJOLNIR/CIO variant was manufactured by Acheron Security and utilized by SPARTAN-IVs [2] and Counter-Intelligence Operators for Intel aquisition and strategic data conveyance deep within enemy territory. It was tested at Gdynia, Acheron Fossae on Mars.[1]

Several CIO-armored Spartans were deployed to Terceira, where they captured and transmitted information crucial to the recovery of the colony from Insurrectionist forces.[3]

In-game information[edit]

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Unlock: Spartan Slayer - Master commendation
Available skins: WEB, RUIN and RUSH


List of appearances[edit]


  1. ^ a b Halo 4 Interactive Guide
  2. ^ Amazon.com Halo 4 pre-order
  3. ^ Halo 4: The Essential Visual Guide, page 148