U.S. Air Force Staff Sgt. Brent Palmer, 23rd Security Forces Squadron patrolman, guards an entry control during an emergency response exercise, Aug. 22, 2017, at Moody Air Force Base, Ga. The purpose of this active-shooter exercise was to inspect the recovery phase of an emergency situation while maintaining realism as members still responded as normal. (U.S. Air Force photo by Airman 1st Class Lauren M. Sprunk)