Major general (United States) held by the commandant was raised to major general. It remained the highest rank in the Marine Corps until January 20, 1942, when the rank held by the commandant was raised to lieutenant general. Given that the U.S. Air Force evolved from its predecessors, the U.S. Army Air Service, the U.S. Army Air Corps and the U.S. Army Air Forces, the rank of major general in the Air Force coincides with its establishment as an independent service in 1947. Major general (United States) In the United States Army, United States Marine Corps, and United States Air Force, major general is
General officers in the United States the Chief of Staff of the Army, who had been a major general, equal rank with the Chief of Naval Operations which had been a four-star position since 1916. Lieutenant Generals were reauthorized on 5 August 1939. Four Lieutenant Generals were authorized as temporary ranks for the commanding officers of the four numbered field armies at the time. The four-star rank of General remained unique to the Chief of Staff. During World War II most American Generals held temporary or “theater” appointments in the Army of the United States. Until the Second World War, the highest Marine Corps general rank