Recruits with Delta Company, 1st Recruit Training Battalion, complete the gas chamber during chemical, biological, radiological, and nuclear (CBRN) defense training at Marine Corps Recruit Depot Parris Island, , Jan. 30, 2023. Training for CBRN defense exposes recruits to gas agents, in order to familiarize them with the use of a gas mask.

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Keywords: cbrn, drill, instructor, marine, mcrdpi, military, training