Marine Corps recruits with Delta Company, 1st Recruit Training Battalion, prepare to break their seal on the M40 confidence chamber in the gas 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