Sergeant Guile is a member of the United States Air Force and takes pride in both his service and his comrades. He often goes out drinking with them when possible. Nash has been his partner for many years, serving together in multiple missions and conflicts. As a soldier, Guile frequently engages in physical training and weightlifting. He has won at least one boxing tournament, though there may be others that aren't mentioned in the show. His martial arts style is based on U.S. Military Combatives, which are the official martial arts taught to military personnel.