U.S. Army Staff Sgt. Hugo Landin rinses his face and mouth with water after coming out of the gas chamber during a training exercise in support of Operation Atlantic Resolve in Latvia, Oct. 21, 2015. OAR provides U.S. soldiers the opportunity to train alongside their NATO counterparts, forge relationships that foster trust and mutual understanding, strengthen interoperability, and demonstrates U.S. commitment to the alliance. Landin is a squad leader assigned to Attack Company 1-503rd Infantry Regiment, 173rd Airborne Brigade, Italy. U.S. Army photo by Staff Sgt. Steven Colvin