U.S. Air Force Staff Sgt. Stephanie Wilburn, a flight attendant assigned to the 310th Airlift Squadron, receives applied pressure to a simulated gunshot wound to the abdomen during an active shooter exercise at MacDill Air Force Base, Fla., Jan. 9, 2017. First responders trained on critical response tactics in case of an active shooter. (U.S. Air Force photo by Airman 1st Class Caleb Nunez)