U.S. Air Force Capt. Adam Morgan, 633rd Security Forces Squadron operations officer, radios in to the command post during an active shooter exercise at Langley Air Force Base, Va., Dec. 8, 2011. The exercise tested the participants’ ability to address communications, response procedures and command and control between first responders and base command and control. (U.S. Air Force photo by Staff Sgt. Antoinette Gibson/Released)