Staff Sgt. Christopher Walker, 436th Security Forces Squadron response force leader, peeks around a cubicle wall during a simulated active shooter scene Oct. 20, 2015, in building 639 on Dover Air Force Base, Del. Walker, along with law officers from the Dover Police Department, Dover, Del.; the Delaware State Police, Troop 3, Camden, Del.; and 436th SFS personnel, initiated a sweep of the building’s first and second floors and warehouse areas. ( Air Force photo/Roland Balik)

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Size: 2584px × 4088px
Photo credit: © AB Forces News Collection / Alamy / Afripics
License: Licensed
Model Released: No

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