Marines assigned to the 22nd Marine Expeditionary Unit participate in a gas chamber training exercise at Fort Pickett, Va., Feb. 15, 2016. The training was conducted as part of annual training required for the Marines preparing for an upcoming deployment. ( Marine Corps photo by Lance Cpl. Koby I. Saunders/ 22 Marine Expeditionary Unit/ Released)

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