Marines with the 24th Marine Expeditionary Unit run through an obstacle course as part of their chemical, biological, radiological, and nuclear training at Camp Lejeune, , April 13, 2016. The training provides Marines with a basic knowledge of how to don and clear a gas mask to effectively defend against chemical or biological assaults. ( Marine Corps photo by Cpl. Todd F. Michalek)

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