Jun 14, 2013

Private First Class Jackson Almaden, 20, a data service technician serving with Headquarters Battalion, 1st Marine Division, and native of Seattle, Wash., breaks the seal on his mask during gas chamber training here, June 12, 2013. While in the chamber, The Marines learned the limitations of their gear by performing basic exercises to get their blood pumping, increase respiratory rates and build confidence that their masks won't come off during movement.

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1st Marine Division