The Ravagers appear to be a special type military defense program that was to be used during the war. After the war, the program became self-aware wishing only to learn as much information as possible. If it encounters any survivor, it can incapacitate them by attempting to steal their memories. The Ravagers also have the ability to transfer their program into other infected. A Ravager infected can be easily distinguished by the glowing red eye module sticking out of the infected’s head