190927-N-ZZ513-1172 SAN DIEGO (Sept. 27, 2019) Vice Adm. John D. Alexander, right, commander of U.S. 3rd Fleet, shakes hands with Chief of Naval Operations (CNO) Adm. Michael M. Gilday, left, during a change of command and retirement ceremony aboard the Nimitz-class aircraft carrier USS Theodore Roosevelt (CVN 71), Sept. 27, 2019. Vice Adm. Scott D. Conn relived Alexander as Commander, U.S. 3rd Fleet during the ceremony. (U.S. Navy photo by Mass Communication Specialist 2nd Class Natalie M. Byers/Released)