The First Fleet was a numbered fleet of the United States Navy, in operation from January 1947 to 1 February 1973 in the western Pacific Ocean as part of the Pacific Fleet. In 1973, it was disestablished and its duties assumed by the United States Third Fleet. Vice Admiral Alfred Montgomery was named as Commander, First Task Fleet, in an air station report of July 1947, with an inspection visit by a group of senior officers. The old cruiser was sunk as an atomic bomb test target during First Task Fleet maneuvers in May 1948. became the flagship of Vice Admiral Gerald Bogan (Commander First Task Fleet) on 25 March 1949. served as flagship for Commander First Fleet early in 1949 for three weeks of amphibious operations in Alaskan waters to evaluate cold weather equipment. served as flagship for Commander, First Fleet, from January 1960 to March 1963. served as flagship in San Diego from 1969 until April 1972, except for yard overhaul in 1970 when assumed the role. On 17 November 2020, Secretary of the Navy Kenneth Braithwaite announced the intention to create a new numbered fleet for the Indian Ocean to be called First Fleet. SECNAV Braithwaite speculated that the new fleet could be headquartered in Singapore or Western Australia. Structure, First Fleet, 1 May 1945 Commander First Fleet, Fleet Admiral Chester Nimitz, Cincpac Commander Battleship Squadron One Vice Admiral Jesse B. Oldendorf Commander Battleship Squadron Two Vice Admiral Willis A. Lee Jr. Commander Cruisers, Pacific Fleet Rear Admiral Walden L. Ainsworth Commander, Air Force, Pacific Fleet Vice Admiral George D. Murray Commander Destroyers, Pacific Fleet Rear Admiral Walden L. Ainsworth Commander Submarine Force, Pacific Fleet Vice Admiral Charles A. Lockwood Commander Amphibious Forces, Pacific Fleet Vice Admiral Richmond K. Turner Commander Motor Torpedo Boat Squadrons, Pacific Fleet Capt. Richard W. Bates Commander Minecraft, Pacific Fleet Rear Admiral Alexander Sharp Jr. Commander Service Force, Pacific Fleet Vice Admiral William W. Smith Commander Fleet Operational Training Command, Pacific Rear Admiral Francis C. Denebrink Commander South Pacific Force and South Pacific Area Vice Admiral William L. Calhoun Chief of Staff Commodore R. P. Class Commander Service Squadron, South Pacific Force Rear Admiral Paul Hendren Chief of Staff Captain F. Close The first ten squadrons and commanders are those of the U.S. Navy type commands in the Pacific Fleet active at the time. Commanders The Navy website says, regarding this list