Pfc. David Chang of the California Army National Guard’s Headquarters Support Company, 40th Infantry Division, exits a gas chamber during the Chemical, Biological, Radiological and Nuclear (CBRN) event of the California’s 2017 Best Warrior Competition Nov. 1-5, 2016, at Camp San Luis Obispo, San Luis Obispo, California. (Army National Guard photo/Sgt. 1st Class Andres J. Viveros)

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Photo credit: © AB Forces News Collection / Alamy / Afripics
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