Cybernetic Humanoid Assault Systems were designed to augment human forces before the war. They can respond to civilian commands assuming that the order is within a military matter, saving helpless civilians and other humanitarian missions are easily with their orders. Some are found disabled and scraped by looters in small military bunkers, and other similar bunkers. The looters no longer able to understand how to repair such a complex machine. Often you can see one or two engaging a Alien hive camp, normally that is enough to destroy such a target. CHAS units also have a support unit called, Autonomous Mapping Exploration and Evasion or AMME. A large cat like robot.
This unit was found in the Isolated VAN RIP bunker, it’s true mission is still something of a mystery. Currently it’s mission is to support the VAN RIP members in their missions. However, the machine does have a mind of it’s own and objectives of it’s own.