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Staff Sgt. Aryol Alvarado-Espinoza, 633rd Security Forces Squadron installation entry controller from Joint Base Langley-Eustis, Virginiaa,., conducts night operation entry control procedures during a field training exercise at Marine Corps Base Quantico, Va., July 31, 2019. During the FTX, members of the 633rd SFS practiced a multitude of techniques ranging from patrolling, reacting to indirect fire and entry control procedures. (U.S. Air Force photo by Airman 1st Class Marcus M. Bullock)
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