Marines with Headquarters Battalion, 1st Marine Division, clear their masks of chlorobenzalmalononitrile gas, commonly known as CS gas, during chemical, biological, radiological and nuclear defense training at Marine Corps Base Camp Pendleton, California, Oct. 20, 2022. CBRN training is conducted annually to ensure Marines know how to use their protective gear in the event of a chemical attack. ( Marine Corps photo by Lance Cpl. Kayla Halloran)

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Keywords: 1st, blue, cbrn, chamber, defense, diamond, division, gas, m50, marine, marines, masks