U.S. Marine Corps Recruits with Golf Company, 2nd Battalion,

U.S. Marine Corps Recruits with Golf Company, 2nd Battalion, Recruit Training Regiment, adjust the gas masks before entering the gas chamber at Page Field on Marine Corps Recruit Depot, Parris Island, S.C., Dec. 13, 2017. Golf Company and November Company, 4th Recruit Training Battalion completed chemical, biological, radiological and nuclear defense training, which is designed to teach recruits how to properly put on, use, and clear a gas mask in combat situations. (U.S. Marine Corps photo by Lance Cpl. Yamil Casarreal/Released)