Guile is a Sergeant in the United States Air Force. He has pride in both the Air Force and his men, and frequently goes out drinking with them whenever they can. He and his partner, Nash, have served together for many years in various missions and military conflicts. As a military person he is regularly found working out and lifting weights.He has won at least one boxing tournament and probably others not mentioned in the show. His martial art style that he uses in combat is loosely based on U.S. Military Combatives, the official martial arts styles that the U.S military teaches to its soldiers

(Source: Wikipedia)