Marines with 3rd Battalion, 2nd Marine Regiment, 2nd Marine Division perform a practice clearing of their M50 gas masks during gas chamber training at Camp Lejeune, North Carolina, Jan. 29, 2020. The Marines participated in the training course to enhance their confidence and proficiency with their chemical, biological, radiological, and nuclear (CBRN) equipment. ( Marine Corps photo by Sgt. Abrey Liggins)

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Photo credit: © Operation 2021 / Alamy / Afripics
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