Lance Cpl. Ryan Fleischer, 20, Bel Air, Md., a chemical, biological, radiological, nuclear defense clerk with 9th Communication Battalion, I Marine Expeditionary Force, instructs Marines on the application of a gas mask during gas chamber training at Camp Pendleton, Calif., March 26. I MHG Marines conduct annual gas chamber training 130326-M-PF875-013

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Photo credit: © PJF Military Collection / Alamy / Afripics
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