When the United States of America entered World War I in 1917, Americans were already fighting by going to Canada and training as pilots. In all, some 125 men received the Medal for their actions in World War I (34 of them posthumously): 92 from the Army, to include 4 from the Air Service, 21 from the Navy (including 10 who received the Medal of non-combat actions) and 8 from the Marine Corps. Among the recipients were Alvin York, who later became the basis for the movie Sergeant York, and Edward Rickenbacker, who became a flying ace. Ralph Talbot of the Marine Corps also became a flying ace and was the first Marine aviator to receive the Medal of Honor.