170915-N-ZZ513-049 SAN DIEGO (Sept. 15, 2017) Vice Adm. Nora W. Tyson gives her final remarks as commander of U.S. 3rd Fleet as she prepares to relinquish command to Vice Adm. John D. Alexander during a change of command and retirement ceremony held aboard the Nimitz-class aircraft carrier USS Theodore Roosevelt (CVN 71), Sept. 15. Tyson is retiring after 38 years of honorable service. (U.S. Navy photo by Mass Communication Specialist Seaman Natalie M. Byers/Released)