Master Sgt. Joe Shepard (left) a flight engineer with the 68th Airlift Squadron, Joint Base San Antonio - Lackland Air Force Base explains an instrument panel to Air Force Academy Cadets Second Class Terry Tilghman and Ryan J. Gourley during an orientation flight on board the C-5A Galaxy aircraft. The cadets observed an aerial refueling mission during the orientation flight (U.S. Air Force photo/ Tech. Sgt. Carlos J. Trevino)