Tech. Sgt. Ajenna Smith, 422nd Security Forces Squadron noncommissioned officer in charge of training and simulated-active shooter, opens fire upon Airmen during an exercise at RAF Croughton, United Kingdom, July 22, 2014. Smith said many active shooters feel angry about a situation in their lives and think the only recourse is to violently act out against innocent bystanders. (U.S. Air Force photo by Staff Sgt. Jarad A. Denton/Released)