General Jim Amos was the 35th Commandant of the Marine Corps from 2010 to 2014. His tenure as leader of the USMC was distinctive on several measures.
The Marines typically select their commandants from the ranks of the infantry. Jim Amos, however, was the first (and to this date, the only) naval aviator selected to lead the Corps. His call sign “Tamer,” General Amos flew the muscular F-4 Phantom and later the F/A-18 Hornet.
He was one of only two commandants to have their careers punctuated by short stints in the civilian world: the 11th Commandant, Major General William Biddle, retired in 1914 but returned to service during World War I. General Amos got out in 1978 and flew commercially for Braniff Airways for a couple years before rejoining the Marines in 1981 (around the time I was a young lance corporal).