170915-N-JO908-278 SAN DIEGO (Sept. 15, 2017) Vice Adm. Nora W. Tyson, left, salutes Adm. Scott H. Swift, commander, U.S. Pacific Fleet, center, relinquishing command of U.S. 3rd Fleet to Vice Adm. John D. Alexander during the Commander, U.S. 3rd Fleet 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 2nd Class Kory Alsberry/Released)