Staff Sgt. Brady Jackson, 422nd Security Forces Squadron patrolman, breaches the office where a simulated-active shooter was hiding during an exercise at RAF Croughton, United Kingdom, July 22, 2014. During the exercise, Security Forces Airmen conducted building sweeps to locate the active shooter and identify survivors and casualties. (U.S. Air Force photo by Staff Sgt. Jarad A. Denton/Released)