U.S. Air Force Airman 1st Class Brett Nott, 633rd Security Forces Squadron installation entry controller, calls the control desk to inform them he apprehended the active shooter during an exercise at Joint Base Langley-Eustis, Va., Dec. 15, 2016. Nott, eliminated the threat of the active shooter after a simulated shoot out. (U.S. Air Force photo by Senior Airman Kimberly Nagle)