U.S. Air Force Staff Sgt. Jonathan Horton, 633rd Security Forces Squadron unit trainer, lays on the ground after being taken down in a simulated hostage situation during a three-part exercise at Langley Air Force Base, Va., Nov. 19, 2013. The exercise was conducted to prepare base personnel on how to respond in the event of a real-world emergency situation. (U.S. Air Force photo by Airman 1st Class Kimberly Nagle/Released)