Infantry shipped down from the Spirit of Fire muster in the firebase's Barracks. The Barracks allows the requisition of Hellbringers, Cyclops, and Snipers and unlocks their upgrade options. Multiple Barracks in a firebase reduces infantry requisition time.
Army and Marine Corps troopers are detached ("chopped") from their parent unit aboard the Spirit of Fire and deployed to reinforce key firebases on the Ark's surface, replacing injured personnel who are then medevac‘d out of the combat zone. While they await assignment to a fireteam, the "new blood" acclimate and review tactical situation reports in the barracks, which doubles as a recreation area and mess hall during lulls in battle.