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. Security Forces Airmen are specifically trained to resolve active shooter scenarios quickly and efficiently, in order to limit potential casualties. (U.S. Air Force photo by Staff Sgt. Jarad A. Denton/Released)