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Staff Sgt. Jonathan Cornelius, Base Defense Operations Center controller assigned to the 319th Security Forces Squadron, conducts a shift change-over in a patrol vehicle on Grand Forks Air Force Base, N.D., Sep. 23, 2021. Security Forces Airmen operate 24/7 to keep the Air Force’s intelligence and surveillance assets secure. (U.S. Air Force photo by Airman 1st Class Jack LeGrand)
24.0-70.0 mm f/2.8
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