Far left, Marine Corps Lance Cpl. James Dietrich, Third Marine Division Headquarters Battalion Chemical, Biological, Radiological and Nuclear platoon, discusses the different functions of a gas chromatography mass spectrometer with fellow service members during the CBRN Exposition Nov. 17, 2016, at Kadena Air Base, Japan. The GCMS classifies, quantifies and confirms chemicals in the air, allowing CBRN personnel to know how to diminish a hazard if one were to occur and send information to commanders. ( Air Force photo by Senior Airman Lynette M. Rolen/Released)

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