Respirator pack

Respirator Packs are equipment used by the UNSC. Respirators are worn by UNSC personnel when an atmosphere is not present, and provide an auxiliary supply of Oxygen to the wearer. Every crewman on a Naval vessel is outfitted with a respirator pack.

The crew of the UNSC Commonwealth were ordered to don respirator packs when Captain Wallace vented atmosphere in the ship to cut off a fire. This was suggested by Doctor Halsey to Captain Wallace who readily agreed.