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Marines searching for casualties in a metro line during training

Chemical, Biological, Radiological, and Nuclear Marines with the 24th Marine Expeditionary Unit search for casualties in a metro line during a course at the Guardian Centers of Georgia in Perry, Ga. October 30, 2020. The course allows Marines to expand their knowledge of procedures and equipment through training in realistic environments. (Source: U.S. Marines Corps photo by Lance Cpl. Nicholas Guevara/Released. National Archives and Records Administration and the Defense Visual Information Distribution Service. Public Domain Dedication.)