Upon his arrival to Tinker Air Force Base, Okla., May 13, 2011, Secretary of Defense Robert Gates is greeted by Maj. Gen. David Gillett, Oklahoma City Air Logistics Center commander, his wife Stacia, and Col. Robert LaBrutta, 72nd Air Base Wing and Tinker Installation commander. Secretary Gates was in Oklahoma to deliver the commencement speech for the University of Oklahoma graduation that evening. (Air Force photo/Margo Wright)