A Marine Corps recruit with Hotel Company, 2nd Recruit Training Battalion, washes his M40 gas mask after the confidence chamber at Marine Corps Base Camp Pendleton, Calif., Jan. 24, 2023. The confidence chamber is used to train 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