A Berserker is a powerful type of combat cyborg first developed and employed by the United States Colonial Marine Corps specifically for Xenomorph-clearing operations. Each Berserker unit consists of a heavily armed and armored combat exosuit encasing a human core, which is sealed inside and hard-wired into the suit's control systems via a neurological control system. During missions, the human operator is fed with a potent cocktail of stimulant drugs that renders them hyper-aggressive and essentially unstoppable.