Marine Corps Cpl. Christopher Rays, a chemical, biological, radiological, and nuclear (CBRN) defense responder with 1st Combat Engineer Battalion, 1st Marine Division, breaks open a 2-chlorobenzalmalononitrile, or CS gas, capsule during an annual Individual Protective Equipment Confidence Exercise (IPECE) qualification on Camp Pendleton, Calif., April 5, 2023. IPECE is an annual requirement for Marines to familiarize themselves with the protective equipment used against a chemical, biological, radiological, and nuclear attack.

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Keywords: annual, cs, gas, marines, mask, mopp, requirements, training