Posted: 04/26/2023
U.S. Marine Corps recruits with Lima Company, 3rd Recruit Training Battalion, execute different movements to test the seal on the M40 gas mask in the confidence chamber on Marine Corps Base Camp Pendleton, Calif., April 25, 2023. The chamber is filled with chlorobenzalmalononitrile, a form of tear gas, to instill confidence in recruits’ skills and their gear in the event of a chemical, biological, radiological, or nuclear attack. (U.S. Marine Corps photo by Sgt. Tyler W. Abbott)