Exercise Beverly Sentinel 17-1
U.S. Air Force Airman 1st Class Andres Martinez, 51st Security Forces Squadron response force member, adjusts his chinstrap after sweeping a building for a simulated gunman during Exercise Beverly Sentinel 17-1 at Osan Air Base, Republic of Korea, May 4, 2017. Defenders were quick to respond to reports of gunfire during the exercise, executing building sweeps, Self-Aid and Buddy Care, and engaging in firefights with the two simulated gunmen. (U.S. Air Force photo by Staff Sgt. Victor J. Caputo)

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Photo by: Staff Sgt. Victor J. Caputo |  VIRIN: 170504-F-AM292-1251.JPG