In custody
U.S. Air Force Master Sgt. Robert Murdock, 23rd Security Forces Squadron flight chief (right), reports an update to the unit control center while Staff Sgt. Kendrick Brooks, 23rd SFS patrolman, guards a simulated gunman during an active shooter exercise at Moody Air Force Base, Ga., June 24, 2011. The gunman was played by Tech. Sgt. Clint Ellis, 23rd SFS plans and programs NCO in-charge. (U.S. Air Force photo by Senior Airman Stephanie Mancha/Released)