Respirator pack

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

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