USS Humboldt (AVP-21) was a United States Navy Barnegat-class small seaplane tender in commission from 1941 to 1947 that served in the Atlantic during World War II. She was briefly reclassified as a miscellaneous auxiliary and redesignated AG-121 during 1945. After the war, she was in commission in the United States Coast Guard as the cutter USCGC Humboldt (WAVP-372), later WHEC-372, from 1949 to 1969.
USS Humboldt (AVP-21) on 23 August 1943 after modification at the Boston Navy Yard, during which she received a third 5-inch (127 mm) 38-caliber dual-purpose gun mount and one quadruple and two twin 40-mm antiaircraft gun mounts.
U.S. President Roosevelt and Brazilian President Getúlio Vargas aboard USS Humboldt, during the Potenji River Conference, with Harry Hopkins, Chairman of the British-American Assignment Board (left), and Jefferson Caffery, U.S. Ambassador to Brazil (right).
USS Humboldt (AVP-21) off Norfolk, Virginia, on 17 November 1944.
USS Humboldt with a PBM Mariner flying boat of VPB-203 at Bahia, Brazil, in April 1945.
Barnegat-class seaplane tender
The Barnegat class was a large class of United States Navy small seaplane tenders (AVP) built during World War II. Thirty were completed as seaplane tenders, four as motor torpedo boat tenders, and one as a catapult training ship.
USS Barnegat (AVP-10), lead ship of the Barnegat-class small seaplane tenders, in Puget Sound on 14 October 1941
