Marine Corps recruits with Delta Company, 1st Recruit Training Battalion, remove the filter on the M40 gas mask in the confidence chamber at Marine Corps Base Camp Pendleton, Calif. Jan. 18, 2023. The confidence chamber trains recruits how to properly use the M40 gas mask and respond to potential chemical and biological threats.

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Keywords: corps, diego, marine, marines, mcrd, recruit, recrut, san, training