Air Force Senior Airman Mark Welch, 633rd Security Forces Squadron, installation entry controller provides security while Staff Sgt. Ryan Vottero (center), 633rd SFS, Base Defense Operations Center operator receives situation reports from squad before proceeding to clear mock control tower building during Combat Readiness Training at Langley Air Force Base, Va., June 27, 2016. Base security operations is one of eight blocks of instruction taught at CRT acting as a refresher/prerequisite for predeployment training. ( Air Force photo by/Tech. Sgt. Daylena S. Ricks)

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Photo credit: © AB Forces News Collection / Alamy / Afripics
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Keywords: af