Command Network Module

The Command Network Module or CNM, is a communication device utilized by the United Nations Space Command, commonly adopted as an external helmet attachment.

Usage
The Command Network Module allows users to communicate and synchronize with the UNSC battle network in real-time. Different CNM variants has been observed across branches and ranks within the UNSC, including UNSC Army troopers, Orbital Drop Shock Troopers, and Spartans.

Compatibility
The CNM has been observed to be compatible with the following helmets;
 * Air Assault
 * CH252 helmet
 * Commando
 * CQB
 * EOD
 * EVA
 * Grenadier
 * HAZOP
 * INTRUDER
 * Mark V
 * Mark VI
 * Mark VII
 * Military Police
 * ODST
 * Operator
 * Scout
 * Security

Variants and configurations
During the Human-Covenant War, the CNM has three observed variants, each with its own distinct physical appearances. The first variant is the ODST-CNM, which is exclusively employed on ODST armors. The other two variants are standard issue to UNSC Special Forces unit commanders, and both variants could be upgraded to the Command Network Module-Improved (CNM-I) variant on the HAZOP and Air Assault variants of MJOLNIR Mark V. After the Human-Covenant War, built-in CNM suites have been integrated to the helmets of the [GEN2] variant of the Commando-class Mjolnir. However, sometimes the CNM is integrated as an external attachment on armor like the INTRUDER-class Mjolnir, while certain CNM variants are still optional attachments, like the CNM[5] on the Mark VII helmet.

CNM[5]
The CNM[5] could be employed on the Mjolnir Mark VII helmet.

ODST-CNM
The ODST-CNM is a specialized variant of the CNM employed by the ODSTs. One was employed by Edward Buck during the Battle of Mombasa.

"Camera" variant
This CNM variant resembles a camera, and is typically worn on the right side of the helmet.

"Tall" variant
This CNM variant is longer, featuring two circular sensors, and can be worn on either side of the helmet.

FC configurations
The modularity of the MJOLNIR armor has made it possible to attach multiple modules on the helmet. In cases where a CNM and a Hardened Uplink (HUL) are both employed, the configurations are designated "FC", "FC-I", and "FC-I[2]" depending on the variants used. FC refers to the configuration in which the "tall" CNM variant and an external HUL are both attached to the helmet. FC-I refers to the configuration in which an external HUL, along with the CNM-I, are integrated on the "camera" CNM variant, though this configuration has only been observed on the MJOLNIR/AA variant. FC-I[2] refers to the configuration in which both the "tall" CNM and HUL[3] are attached to the helmet.

Gameplay
The CNM and its variants serve as cosmetics and have no impact on gameplay.

Halo: Reach
The "camera" and "tall" variants of the CNM are available as attachments on several helmets in the armor permutations of Halo: Reach. The device is priced at different levels of Credits, depending on the base helmets. In Halo: The Master Chief Collection, the same CNM-attached helmets are unlockable in Season 1: Noble.

Halo Infinite
The CNM[5] will be available on the Mark VII helmet in Halo Infinite.

Production notes

 * During the Halo: Reach Multiplayer Beta, the Mark V[B] helmet had a "CNM" upgrade available, though the CNM resembled a sun visor which extended above the visor. The device cost 2,000 cR, but was cut from the final game.
 * During the Halo: Reach Multiplayer Beta, the "camera" variant of the CNM on the CQC helmet, along with UA attachment on the Mark V[B] helmet, was labelled as HUL. The "tall" variant on the Military Police helmet, however, was correctly labelled "CNM".
 * In the final release of Halo: Reach, two mislabeled helmet attachments involved the CNM:
 * The standard HUL variant mislabeled as the CNM on the EVA[C] helmet.
 * The "Camera" CNM variant mislabeled as the UA/HUL-I on the Mark VI helmet.
 * Although the ODST armor/HVY armor in the Halo 3 portion of Halo: The Master Chief Collection was based on the armor worn by Victor Ramos in Halo: Fireteam Raven, Ramos's helmet did employ the UA and CNM attachments in Halo: Fireteam Raven.

List of appearances

 * Halo 3
 * Halo 3: ODST
 * Remember Reach
 * Birth of a Spartan
 * Deliver Hope
 * Halo: Reach
 * Halo: Fireteam Raven
 * Halo 5: Guardians
 * Halo Infinite