The Apesuit is a specialized armored suit, used by both the United States Colonial Marine Corps and Weyland-Yutani combat personnel. The suit effectively protects the wearer from the hazardous effects of Xenomorph acidic blood.
The Apesuit first appears in Alien3, being worn by the Weyland-Yutani Commandos accompanying Michael Bishop and his science team on Fiorina "Fury" 161. One of the Apesuit-wearing commandos is responsible for the death of Francis Aaron. The Apesuit later appeared in the video games Alien Trilogy and Aliens versus Predator 2, where it is used by some Weyland-Yutani troops.
In Aliens versus Predator: Extinction, the Ape Suit is worn by Colonial Marine flamethrower units; it additionally protects the wearer from Facehugger attacks as long as they are not comatose, as the Facehugger will then have time to pry the suit's mask off and gain access to the victim within. The Apesuits in this game are considerably bulkier than those seen previously.