If Secretary of Defense nominee Chuck Hagel is confirmed by the Senate in the coming weeks, he will be the ninth person to hold that office who served in the U.S. Army – more than any other military branch. Of the 22 different men who have served as Defense Secretary, eight served in the Army, with seven in the Navy, and one in the Air Force. More than a quarter of those who have headed the Defense Department did not serve in the military (6 of 22, 27 percent), with the most recent being Clinton appointee William Cohen. Hagel served from 1967 to 1968 and attained the rank of Sergeant E-5.