AIR ASSAULT-class Mjolnir

"The MJOLNIR/AA variant was developed as an improvement of the venerable ODST helmet"

- Description of the Air Assault helmet.

The MJOLNIR Powered Assault Armor/AA variant, or Air Assault, is a helmet variant of the MJOLNIR Powered Assault Armor. It was developed as an improvement to the ODST helmet. It is available to players as a helmet in Halo: Reach.

Two uprades are availible for the helmet, the first adds an Up-Armor plate with a Command Network Module on the right side (UA/CNM), and the second adds an Up-Armor plate with a Command Network Module-Improved on the right side (incorrectly called FC-I) (FC-I, should be UA/CNM-I). It is unknown what FC-I stands for, but it is the term used when a CNM-I and HUL are equipped together, which is never actually seen in the armory.