Senior Master Sgt. Juanita Withrow, 434th Force Support Squadron military personnel section superintendent, locks the front door of Bldg. 596 in reaction to an active-shooter exercise held here July 13, 2013. The base exercise and evaluation team held the exercise to gauge Grissom's response to a shooter on base. (U.S. Air Force photo/Tech. Sgt. Douglas Hays)
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