Dec 6, 2011

U.S. Marine Corps Chief Warrant Officer 2 Christopher Joy, left, 26th Marine Expeditionary Unit CBRN officer, shows Col. Matthew St. Clair, 26th MEU commanding officer, how to operate an M-50 gas mask before entering a gas chamber on Camp Lejeune, N.C., Dec. 6, 2011. 26th MEU Marines conducted their annual chemical, biological, radiological and nuclear defense qualification, which familiarizes Marines with the M-50 gas mask and how to operate it in case of a chemical attack.

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