Marines with Marine Corps Embassy Security break the seal of their masks during a gas chamber training exercise at Marine Corps Base Quantico, Va., Nov. 20, 2017. Participants for the exercise went through a series of tests to ensure proper use of a gas mask. ( Marine Corps photo by Lance Cpl. Cristian L. Ricardo)

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Photo credit: © AB Forces News Collection / Alamy / Afripics
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Keywords: chamber, comcam, comcamfeature, corps, gas, marine, mcb, mcesg, quantico