John Zimmer (left), a security specialist at Headquarters Battalion, Marine Forces Reserve, practices a leg lock on his coach, Reilly Bodycomb, before his debut fight at the Caged Warrior Championship V on Oct. 4, 2014, in Patterson, La. He practices a form of martial arts called combat Sambo, which helps him with quick takedowns and submissions during mixed martial arts fights. Zimmer works as a civilian at Marine Corps Support Facility New Orleans, but he is also a Marine in the Individual Ready Reserve.