171006-N-HI707-640 NORFOLK (Oct. 6, 2017) The American flag flies at half-mast aboard the Virginia-class attack submarine Pre-Commissioning Unit (PCU) Washington (SSN 787) to honor the victims of the tragedy in Las Vegas, Nev. Washington is the U.S. Navy’s 14th Virginia-class attack submarine and the fourth U.S. Navy ship named for the state of Washington. (U.S. Navy photo by Chief Mass Communication Specialist Darryl I. Wood/Released)