USS Humboldt

	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.
History
United States
Name	USS Humboldt (AVP-21)
Namesake	Humboldt Bay, on the northern coast of California
Builder	Boston Navy Yard, Boston, Massachusetts
Laid down	6 September 1940
Launched	17 March 1941
Sponsored by	Mrs. William T. Tarrant
Commissioned	7 October 1941
Reclassified	Miscellaneous auxiliary (as press information ship), AG-121, 30 July 1945; Returned to seaplane tender designation, AVP-21, in 1945 after conversion to AG-121 cancelled;
Decommissioned	17 March 1947
Stricken	1970
Fate	Loaned to U.S. Coast Guard, 24 January 1949; Transferred outright to Coast Guard 26 September 1966;
Acquired	Transferred from U.S. Coast Guard 30 September 1969
Stricken	1970
Fate	Sold for scrapping 1970
United States
Name	USCGC Humboldt (WAVP-372)
Namesake	Previous name retained
Acquired	Loaned by United States Navy to Coast Guard 24 January 1949; Transferred permanently from Navy to Coast Guard 26 September 1966;
Commissioned	29 March 1949
Reclassified	High endurance cutter, WHEC-372, 1 May 1966
Decommissioned	30 September 1969
Fate	Transferred to U.S. Navy 30 September 1969
General characteristics (seaplane tender)
Type	Barnegat-class small seaplane tender
Displacement	1,766 tons (light); 2,750 tons (full load);
Length	311 ft 8 in (95.00 m)
Beam	41 ft 1 in (12.52 m)
Draft	13 ft 6 in (4.11 m)
Installed power	6,000 horsepower (4.48 megawatts)
Propulsion	Diesel engines, two shafts
Speed	18.6 knots (34.4 km/h)
Complement	215 (ship's company); 367 (including aviation unit);
Sensors &; processing systems	Radar; sonar
Armament	2 × single 5 in (130 mm) 38-caliber dual-purpose gun mount; 4 × dual 20 mm antiaircraft gun mounts; 2 × depth charge tracks;
Aviation facilities	Supplies, spare parts, repairs, and berthing for one seaplane squadron; 80,000 US gallons (300,000 L) aviation fuel
General characteristics (Coast Guard cutter)
Class & type	Casco-class cutter
Displacement	2,498 tons (full load) in 1966
Length	311 ft 7.75 in (94.9897 m) overall; 300 ft 0 in (91.44 m) between perpendiculars
Beam	41 ft 0 in (12.50 m) maximum
Draft	12 ft 9 in (3.89 m) maximum
Installed power	6,250 bhp (4,660 kW) in 1966
Propulsion	Fairbanks-Morse direct-reversing diesel engines, two shafts; 166,430 US gallons (630,000 L) of fuel
Speed	17.3 knots (32.0 km/h) (maximum sustained in 1966); 10.0 knots (18.5 km/h) (economic);
Range	10,138 nautical miles (18,776 km) at 17.3 knots (32.0 km/h) in 1966; 20,500 nautical miles (38,000 km) at 11.0 knots (20.4 km/h) in 1966;
Complement	151 (10 officers, 3 warrant officers, 138 enlisted personnel)
Sensors &; processing systems	Radars in 1966: SPS-23, SPS-29B; Sonar in 1966: SQS-1;
Armament	In 1966: one single 5-inch (127 mm) 38-caliber Mark 12 gun mount, 1 x Mark 52 director, 1 x Mark 26 fire-control radar, 1 x Mark 10 Mod 0 antisubmarine projector, 2 x Mark 32 Mod 2 torpedo tubes

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.

History
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.
United States
Name	USS Humboldt (AVP-21)
Namesake	Humboldt Bay, on the northern coast of California
Builder	Boston Navy Yard, Boston, Massachusetts
Laid down	6 September 1940
Launched	17 March 1941
Sponsored by	Mrs. William T. Tarrant
Commissioned	7 October 1941
Reclassified	Miscellaneous auxiliary (as press information ship), AG-121, 30 July 1945 Returned to seaplane tender designation, AVP-21, in 1945 after conversion to AG-121 cancelled
Decommissioned	17 March 1947
Stricken	1970
Fate	Loaned to U.S. Coast Guard, 24 January 1949 Transferred outright to Coast Guard 26 September 1966
Acquired	Transferred from U.S. Coast Guard 30 September 1969
Stricken	1970
Fate	Sold for scrapping 1970
United States
Name	USCGC Humboldt (WAVP-372)
Namesake	Previous name retained
Acquired	Loaned by United States Navy to Coast Guard 24 January 1949 Transferred permanently from Navy to Coast Guard 26 September 1966
Commissioned	29 March 1949
Reclassified	High endurance cutter, WHEC-372, 1 May 1966
Decommissioned	30 September 1969
Fate	Transferred to U.S. Navy 30 September 1969
General characteristics (seaplane tender)
Type	Barnegat-class small seaplane tender
Displacement	1,766 tons (light) 2,750 tons (full load)
Length	311 ft 8 in (95.00 m)
Beam	41 ft 1 in (12.52 m)
Draft	13 ft 6 in (4.11 m)
Installed power	6,000 horsepower (4.48 megawatts)
Propulsion	Diesel engines, two shafts
Speed	18.6 knots (34.4 km/h)
Complement	215 (ship's company) 367 (including aviation unit)
Sensors & processing systems	Radar; sonar
Armament	2 × single 5 in (130 mm) 38-caliber dual-purpose gun mount 4 × dual 20 mm antiaircraft gun mounts 2 × depth charge tracks
Aviation facilities	Supplies, spare parts, repairs, and berthing for one seaplane squadron; 80,000 US gallons (300,000 L) aviation fuel
General characteristics (Coast Guard cutter)
Class & type	Casco-class cutter
Displacement	2,498 tons (full load) in 1966
Length	311 ft 7.75 in (94.9897 m) overall; 300 ft 0 in (91.44 m) between perpendiculars
Beam	41 ft 0 in (12.50 m) maximum
Draft	12 ft 9 in (3.89 m) maximum
Installed power	6,250 bhp (4,660 kW) in 1966
Propulsion	Fairbanks-Morse direct-reversing diesel engines, two shafts; 166,430 US gallons (630,000 L) of fuel
Speed	17.3 knots (32.0 km/h) (maximum sustained in 1966) 10.0 knots (18.5 km/h) (economic)
Range	10,138 nautical miles (18,776 km) at 17.3 knots (32.0 km/h) in 1966 20,500 nautical miles (38,000 km) at 11.0 knots (20.4 km/h) in 1966
Complement	151 (10 officers, 3 warrant officers, 138 enlisted personnel)
Sensors & processing systems	Radars in 1966: SPS-23, SPS-29B Sonar in 1966: SQS-1
Armament	In 1966: one single 5-inch (127 mm) 38-caliber Mark 12 gun mount, 1 x Mark 52 director, 1 x Mark 26 fire-control radar, 1 x Mark 10 Mod 0 antisubmarine projector, 2 x Mark 32 Mod 2 torpedo tubes