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U.S. Marine recruits train in chemical warfare defense on Parris Island, South Carolina

Cpl. Brandon Dockery, a chemical and biological warfare defense instructor, fans tear gas in the gas chamber on November 27, 2013, on Parris Island, S.C., as recruits of Mike Company, 3rd Recruit Training Battalion, prove their gas masks hold an air-tight seal despite vigorous activity. This training ensures recruits can use the masks and trust them to work in a chemically or biologically contaminated area. Photo by Cpl. Caitlin Brink, released. (This image was released by the United States Marine Corps with the ID 131127-M- FS592-170. 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.)