180317-N-HI707-430 GROTON, Conn. (March 17, 2018) The National Ensign is raised aboard the Virginia-class attack submarine USS Colorado (SSN 788) during its commissioning ceremony. Colorado is the U.S. Navy's 15th Virginia-class attack submarine and the fourth U.S. Navy ship named for the state of Colorado. (U.S. Navy photo by Chief Petty Officer Darryl I. Wood/Released)