Marines with the 11th Marine Expeditionary Unit, I Marine Expeditionary Force, execute the hand-and-arm signal for a chemical, biological, radiological, and nuclear (CBRN) attack during an annual Individual Protective Equipment Confidence Exercise (IPECE) qualification in a 2-chlorobenzalmalononitrile, or CS gas, filled chamber on Camp Pendleton, Calif., April 5, 2023. IPECE is an annual requirement for Marines to familiarize themselves with the protective equipment used against a CBRN attack.

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