Air Force Staff Sgt. Sammy McCain, 51st Munitions Squadron armament support technician, takes off his helmet during a no-notice exercise at Osan Air Base, Republic of Korea, May 5, 2017. Members from various units were instructed to don and doff Mission Oriented Protective Posture to test how well they would respond to a sudden chemical attack.

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Photo credit: © David Wa / Alamy / Afripics
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