U.S. soldiers in Stryker armored vehicles arrive at Smardan Training Area, Romania, March 24, 2015. The soldiers, assigned to 2nd Squadron, 2nd Cavalry Regiment, participated in Saber Junction 15, which included 5,000 troops from 17 nations that are NATO allies and partners. (U.S. Army photo by Staff Sgt. Opal Vaughn/Released)