U.S. Air Force Master Sgt. Blake Pumphrey of the 182nd

U.S. Air Force Master Sgt. Blake Pumphrey of the 182nd Security Forces Squadron, playing the role of an active shooter, surrenders during a training exercise in Peoria, Ill., June 11, 2014. The squadron trained with weapons loaded with paint ammunition to enhance their response skills. The Air Force defines an active shooter as someone actively trying to kill people, most often in populated areas. In most cases, active shooters use firearms, and there is no pattern to selecting victims. Valuable training on surviving an active shooter can be found at www.BeReady.af.mil. (U.S. Air National Guard photo by Staff Sgt. Lealan Buehrer/Released)