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U.S. Marines with Combat Logistics Company 36 don their M50 Joint Service General Purpose Masks during chemical, biological, radiological and nuclear defense training at Marine Corps Air Station Iwakuni, Japan, Aug. 10, 2016. Marines, already in mission oriented protective posture gear, were evaluated on their ability to effectively detect, report, respond and operate in a simulated CBRN environment. When given the signal “gas, gas, gas,” Marines scrambled to don their M50 Joint Service General Purpose Masks before returning to work as if everything was normal. Conducting this training helps Marines refresh their tactical skill sets specific to CBRN response, maintain situational readiness and ensures the safety of personnel.