Marine Corps Pfc. Efrain Mancilla, a Marine with Marine Aircraft Group 12 chemical biological and nuclear defense, puts on a mission oriented protective posture suit to practice contamination control with his Airmen counter-parts in preparation for Vigilant Ace 17-1 at Osan Air Base, Korea, Nov. 17, 2016. Vigilant Ace is a biannual, bilateral training event that exercises military and Republic of Korea Air Force interoperability through simulated wartime tasking.

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Photo credit: © Apple White / Alamy / Afripics
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Keywords: 17-1, ace, archive, armed, bilateral, cbrn, defence, forces, mag-12, military, mwss-171, osan, reportage, servicemen, training, usa, vigilant