U.S. military Vietnam Conflict-era memorabilia is displayed at the Joint Base Langley-Eustis Vietnam Commemoration at Fort Eustis, Va., May 16, 2015. The 16th Cavalry wore items that said “Low Level Hell” because their helicopter, the OH-6 Cayuse, flew low and fast. (U.S. Air Force photo by Staff Sgt. Natasha Stannard/Released)