COMMANDO helmets are compatible with all MJOLNIR systems, as well as both CMA and UNSCUNSC battle network protocols. The former proved to be invaluable in late-war efforts to recontract Outer Colonies that had been cut off by the Covenant advance.
Season 01: Heroes of Reach Battle Pass level 15 (Premium)
Late-iteration prototypes of the MARK VI helmet were undergoing final testing just weeks before the Covenant assault on Reach. Unfortunately, much of the resulting combat data was not recoverable by the Seongnam-based development team.
Season 01: Heroes of Reach Battle Pass level 84 (Premium)