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National Army Gas Mask School, World War I

A class of Army soldiers getting instructions on the use of gas masks on February 26, 1918. U.S. Chemical Warfare Service, World War I. National Archives and Records Administration, cataloged under the National Archives Identifier (NAID) 26423842. (This image is a work of a U.S. military or Department of Defense employee, taken or made as part of that person's official duties. As a work of the U.S. federal government, the image is in the public domain in the United States. Photograph edited by Dr. Douglas J Lanska.)