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MARINE CORPS AIR STATION IWAKUNI, Japan (Nov. 18, 2015) - Reconnaissance, surveillance and decontamination Marines don mission-oriented protective postures four gear during a simulated chemical attack at the Marine Wing Support Squadron 171 motor transportation. As part of an operational decontamination exercise, this is just a glimpse of MWSS-171s annual unit level chemical, biological, radiological and nuclear defense training that enables combat proactivity and readiness.