Annual training - Defense imagery management operations center

From right, U.S. Air Force Senior Airmen Derek Timmons and Andrew Vandal, both with the 219th Security Forces Squadron, North Dakota Air National Guard, secure a perimeter fence during an exercise simulating the recapture of a missile launch facility at Minot Air Force Base, N.D., May 21, 2014. The scenario was part of annual training that prepared the Airmen for a real-world response. (U.S. Air National Guard photo by Senior Master Sgt. David H. Lipp/Released)