190927-N-BB269-1038 SAN DIEGO (Sept. 27, 2019) Chief of Naval Operations (CNO) Adm. Mike Gilday attends the U.S. 3rd Fleet change of command and retirement ceremony aboard the Nimitz-class aircraft carrier USS Theodore Roosevelt (CVN 71). Vice Adm. John D. Alexander retired after 37 years of honorable service, relinquishing command of U.S. 3rd Fleet to Vice Adm. Scott D. Conn. (U.S. Navy photo by Mass Communication Specialist 1st Class Raymond D. Diaz III/Released)