U.S. Air Force Senior Airman Brent Buck, 633rd Civil Engineer Squadron civil engineer, examines examples of identification cards during a training session at Langley Air Force Base, Va., June 28, 2013. As entry control support personnel for the 633rd Security Forces Squadron, Airmen are trained on credentials, safe havens, Department of Defense shipments coming on base, political asylum situations and closures due to emergencies. (U.S. Air Force photo by Senior Airman Kayla Newman/Released)