Return of the Living Dead III

Curt Reynolds steals his father's security key card, and he and his girlfriend, Julie Walker, explore the military base where his father works. They observe Curt's father, Colonel John Reynolds, Col. Peck and Lt. Col. Sinclair overseeing an experiment with a deceased body. The corpse is exposed to 2-4-5 Trioxin gas, which re-animates the corpse into a zombie. The military hopes to use zombies in combat. However, they are impossible to control as their hunger for human brains causes them to constantly attack.