U.S. Air Force Master Sgt. Scott Wagonblott, 633rd Communications Squadron information assurance manager, approaches a simulated gunshot victim during an active-shooter exercise at Langley Air Force Base, Va. Nov. 19, 2013. The simulation featured Wagonblott opening fire on unsuspecting victims during a failed vehicle sale at the base dormitory parking lots. (U.S. Air Force photo by Airman 1st Class Kimberly Nagle/Released)