U.S. Air Force Master Sgt. Scott Wagonblott, 633rd Communications Squadron information assurance manager, grabs a simulated weapon during an active-shooter exercise at Langley Air Force Base, Va., Nov. 19, 2013. During the exercise, Wagonblott portrayed a distressed Airman to test Langley Airmen’s emergency-response procedures. (U.S. Air Force photo by Airman 1st Class Victoria H. Taylor/Released)