Tech. Sgt. Jacob Udell, 2nd Security Forces Squadron flight sergeant, stands guard at the entrance of a room during an active shooter exercise at Barksdale Air Force Base, Louisiana, Sept. 16, 2021. The 2nd SFS Airmen are the first to respond to an active shooter and they're tasked with neutralizing the threat and protecting base personnel. (U.S. Air Force photo by Airman 1st Class Jonathan E. Ramos)
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