It is used by Counter-Intelligence Operators for intel acquisition and strategic data conveyance deep within enemy territory.
- This armor is gained by earning the Spartan Slayer-Master commendation.
- The CIO WEB skin was a pre-order bonus from Amazon.
- The CIO RUIN skin came as a code from McFarlane purple CIO spartan action figure toy.
- The CIO RUSH skin is unlocked in Halo 4 by playing Halo: Spartan Assault in conjunction with purchasing the Halo 4 Bullseye Pack.