Command Network Module
From Halopedia, the Halo wiki
The External Command Network Module or CNM, is an external attachment to MJOLNIR Powered Assault Armor helmets.[1]
Two different models are known, one designed for the Military Police helmet, and an Up-Armored variant for the ODST Helmet. The former is standard issue to Special Force unit commanders and Beta-5 Security units patrolling the Inner Colonies, while the latter seems to be exclusively used by the ODSTs. The two devices differ in appearance as well as their pricing.[1]
The CNM is available as a helmet accessory in Halo: Reach. The device for the MP variant is priced at 5,000 cR, while the ODST variant is priced at 1,000 cR.[1][2]
During the Halo: Reach Multiplayer Beta, the Mark V[B] helmet had a CNM upgrade available. The device cost 2,000 cR, but was cut from the final game.
