Airman 1st Class Kory Caldwell, an Airman assigned to the 455th Expeditionary Security Forces Squadron, monitors an entry control point at Bagram Airfield, Afghanistan, Aug. 18, 2012. Bagram’s large size and vital mission make it a strategic target for insurgents seeking to demonstrate capability, which is why the Airmen from 455 ESFS remain ever-vigilant against the threat of enemy attacks. (U.S. Air Force photo/Capt. Raymond Geoffroy)