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Marine recruits train in chemical warfare defense on Parris Island

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Recruits of Mike Company, 3rd Recruit Training Battalion, test the seal on their gas masks while in the gas chamber on July 22, 2014 at Parris Island, S.C. The recruits proved they learned the basics of biological and chemical warfare defense by properly using gas masks while being exposed to tear gas. U.S. Marine Corps photograph by Cpl. Caitlin Brink. (This image was released by the United States Marine Corps with the ID 140722-M- FS592-101. This file is a work of a sailor or employee of the U.S. Navy, taken or made as part of that person's official duties. As a work of the U.S. federal government, it is in the public domain in the United States.)