U.S. Marine Corps Gen. James F. Amos, left, the commandant of the Marine Corps, exchanges greetings with a Marine while attending a luncheon with students and faculty of the Air War College at Maxwell Air Force Base, Ala., Sept. 11, 2012. The college, which is the senior Air Force professional military school, accepts students from all branches of the U.S. military and federal agencies, as well as international fellows. (U.S. Marine Corps photo by Sgt. Mallory S. VanderSchans/Released)