U.S. Marine Corps photo by Lance Cpl. Julio McGraw/Released 140115-M-FZ867-250.JPG
Feb 12, 2015
A corpsman from 1st Battalion, 7th Marine Regiment, looks on as 2-Chlorobenzalmalononitrile, commonly known as CS Gas, approaches the defensive positions 3rd Battalion, 7th Marines held during the Marine Corps Combat Readiness Evaluation Exercise, Jan.15, 2015. Marines of 3/7 were evaluated at a battalion level on their ability to handle physical and chemical attacks. (Official Marine Corps Photo by. Lance Cpl. Julio McGraw/Released)
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