U.S. Air Force Senior Airmen Kip Vaughan and Quatari Moodie, 633rd Security Forces Squadron response force leaders, take cover during an exercise at Langley Air Force Base, Va., May 5, 2015. Patrolling Security Forces members are tasked with building checks, traffic monitoring, frequent perimeter checks and reporting observed safety violations. (U.S. Air Force photo illustration by Airman 1st Class Devin S. Michaels/Released)