USS Humboldt (AVP-21) was a United States Navy

United States Navy

The United States Navy is the naval warfare service branch of the United States Armed Forces and one of the seven uniformed services of the United States. The U.S. Navy is the largest in the world; its battle fleet tonnage is greater than that of the next 13 largest navies combined. The U.S...

 Barnegat-class

Barnegat class seaplane tender

|The Barnegat class was a large class of United States Navy small seaplane tenders built during World War II. Thirty were completed as seaplane tenders, four as motor torpedo boat tenders, and one as a catapult training ship.-Design:...

 small seaplane tender

Seaplane tender

A seaplane tender is a ship that provides facilities for operating seaplanes. These ships were the first aircraft carriers and appeared just before the First World War.-History:...

 in commission from 1941 to 1947. She was briefly reclassified as a miscellaneous auxiliary and redesignated AG-121 during 1945.

Construction and commissioning

Humboldt (AVP-21) was laid down at the Boston Navy Yard

Boston Navy Yard

The Boston Navy Yard, originally called the Charlestown Navy Yard and later Boston Naval Shipyard, was one of the oldest shipbuilding facilities in the United States Navy. Established in 1801, it was officially closed as an active naval installation on July 1, 1974, and the property was...

 in Boston, Massachusetts, on 6 September 1940. She was launched on 17 March 1941, sponsored by Mrs. William T. Tarrant, and commissioned

Ship commissioning

Ship commissioning is the act or ceremony of placing a ship in active service, and may be regarded as a particular application of the general concepts and practices of project commissioning. The term is most commonly applied to the placing of a warship in active duty with its country's military...

 on 7 October 1941 with Commander

Commander

Commander is a naval rank which is also sometimes used as a military title depending on the individual customs of a given military service. Commander is also used as a rank or title in some organizations outside of the armed forces, particularly in police and law enforcement.-Commander as a naval...

 W. G. Tomkinson in command.

South Atlantic operations

Following rigorous shakedown

Sea trial

A sea trial is the testing phase of a watercraft . It is also referred to as a "shakedown cruise" by many naval personnel. It is usually the last phase of construction and takes place on open water, and can last from a few hours to many days.Sea trials are conducted to measure a vessel’s...

 training off the United States East Coast, Humboldt sailed from Norfolk, Virginia

Norfolk, Virginia

Norfolk is an independent city in the Commonwealth of Virginia in the United States. With a population of 242,803 as of the 2010 Census, it is Virginia's second-largest city behind neighboring Virginia Beach....

, on 13 May 1942 to join Rear Admiral

Rear Admiral

Rear admiral is a naval commissioned officer rank above that of a commodore and captain, and below that of a vice admiral. It is generally regarded as the lowest of the "admiral" ranks, which are also sometimes referred to as "flag officers" or "flag ranks"...

 Jonas H. Ingrain's South Atlantic Force on the coast of Brazil. After stops at San Juan, Puerto Rico

San Juan, Puerto Rico

San Juan , officially Municipio de la Ciudad Capital San Juan Bautista , is the capital and most populous municipality in Puerto Rico, an unincorporated territory of the United States. As of the 2010 census, it had a population of 395,326 making it the 46th-largest city under the jurisdiction of...

, and Trinidad

Trinidad

Trinidad is the larger and more populous of the two major islands and numerous landforms which make up the island nation of Trinidad and Tobago. It is the southernmost island in the Caribbean and lies just off the northeastern coast of Venezuela. With an area of it is also the fifth largest in...

, she arrived at Recife, Brazil, on 5 August 1942 and began tending the seaplane

Seaplane

A seaplane is a fixed-wing aircraft capable of taking off and landing on water. Seaplanes that can also take off and land on airfields are a subclass called amphibian aircraft...

s of Patrol Squadron 83 (VP-83).

During the months that followed, these patrol aircraft, operating with ships of the Brazilian Navy

Brazilian Navy

The Brazilian Navy is a branch of the Brazilian Armed Forces responsible for conducting naval operations. It is the largest navy in Latin America...

 and U.S. Navy, patrolled the South Atlantic Ocean sea lanes and hunted Axis

Axis Powers

The Axis powers , also known as the Axis alliance, Axis nations, Axis countries, or just the Axis, was an alignment of great powers during the mid-20th century that fought World War II against the Allies. It began in 1936 with treaties of friendship between Germany and Italy and between Germany and...

 submarine

Submarine

A submarine is a watercraft capable of independent operation below the surface of the water. It differs from a submersible, which has more limited underwater capability...

s. Humboldt supplied and repaired seaplanes and, in addition, carried aviation gasoline to outlying air bases along the Brazilian coast while engaging in antisubmarine patrols herself.

President Roosevelt arrives on board

While at Natal, Brazil, on 28 January 1943, Humboldt was the site of a conference between President Franklin D. Roosevelt

Franklin D. Roosevelt

Franklin Delano Roosevelt , also known by his initials, FDR, was the 32nd President of the United States and a central figure in world events during the mid-20th century, leading the United States during a time of worldwide economic crisis and world war...

, who was returning from the Casablanca Conference, and President Getúlio Vargas

Getúlio Vargas

Getúlio Dornelles Vargas served as President of Brazil, first as dictator, from 1930 to 1945, and in a democratically elected term from 1951 until his suicide in 1954. Vargas led Brazil for 18 years, the most for any President, and second in Brazilian history to Emperor Pedro II...

 of Brazil. This meeting helped to achieve even closer cooperation between the naval units of the two countries.

Continued South Atlantic operations

After the meeting of the two presidents, Humboldt continued to visit isolated ports on the Brazilian coast with supplies and established a new seaplane base at Aratú, Bahia

Bahia

Bahia is one of the 26 states of Brazil, and is located in the northeastern part of the country on the Atlantic coast. It is the fourth most populous Brazilian state after São Paulo, Minas Gerais and Rio de Janeiro, and the fifth-largest in size...

, Brazil, in May 1943.

North Atlantic operations

Humboldt headed north on 1 July 1943, arriving at Boston, Massachusetts, on 17 July 1943 to take up new duties in the North Atlantic Ocean. Departing on 23 August 1943, she carried supplies and parts to U.S. Navy fleet air wings in Newfoundland

Dominion of Newfoundland

The Dominion of Newfoundland was a British Dominion from 1907 to 1949 . The Dominion of Newfoundland was situated in northeastern North America along the Atlantic coast and comprised the island of Newfoundland and Labrador on the continental mainland...

, Iceland

Iceland

Iceland , described as the Republic of Iceland, is a Nordic and European island country in the North Atlantic Ocean, on the Mid-Atlantic Ridge. Iceland also refers to the main island of the country, which contains almost all the population and almost all the land area. The country has a population...

, and the United Kingdom. She continued this dangerous duty, often sailing unescorted, into the early months of 1944, occasionally sailing to Casablanca

Casablanca

Casablanca is a city in western Morocco, located on the Atlantic Ocean. It is the capital of the Grand Casablanca region.Casablanca is Morocco's largest city as well as its chief port. It is also the biggest city in the Maghreb. The 2004 census recorded a population of 2,949,805 in the prefecture...

, French Morocco

French Morocco

French Protectorate of Morocco was a French protectorate in Morocco, established by the Treaty of Fez. French Morocco did not include the north of the country, which was a Spanish protectorate...

 as well.

Humboldt was at Casablanca in late May 1944 when she heard that a German submarine had torpedo

Torpedo

The modern torpedo is a self-propelled missile weapon with an explosive warhead, launched above or below the water surface, propelled underwater towards a target, and designed to detonate either on contact with it or in proximity to it.The term torpedo was originally employed for...

ed escort aircraft carrier

Escort aircraft carrier

The escort aircraft carrier or escort carrier, also called a "jeep carrier" or "baby flattop" in the USN or "Woolworth Carrier" by the Royal Navy, was a small and slow type of aircraft carrier used by the British Royal Navy , the Imperial Japanese Navy and Imperial Japanese Army Air Force, and the...

  and destroyer escort

Destroyer escort

A destroyer escort is the classification for a smaller, lightly armed warship designed to be used to escort convoys of merchant marine ships, primarily of the United States Merchant Marine in World War II. It is employed primarily for anti-submarine warfare, but also provides some protection...

  in the Atlantic, sinking Block Island and damaging Barr. Humboldt steamed out to help with survivors and to escort Barr to safety.

Humboldt was soon underway again, this time to bring an experienced U.S. Navy submarine officer to rendezvous with escort aircraft carrier hunter-killer group, which had just captured the in an epic encounter on 4 June 1944.

Humboldt continued to bring supplies to aviation squadrons

Squadron (aviation)

A squadron in air force, army aviation or naval aviation is mainly a unit comprising a number of military aircraft, usually of the same type, typically with 12 to 24 aircraft, sometimes divided into three or four flights, depending on aircraft type and air force...

 in the Azores

Azores

The Archipelago of the Azores is composed of nine volcanic islands situated in the middle of the North Atlantic Ocean, and is located about west from Lisbon and about east from the east coast of North America. The islands, and their economic exclusion zone, form the Autonomous Region of the...

 and North Africa until 22 March 1945.

Return to South Atlantic service

On 22 March 1945, Humboldt departed Norfolk, Virginia, for Brazil. Returning to her original seaplane tending duties in the South Atlantic, Humboldt arrived at Recife, Brazil, on 5 April 1945 and remained on duty until the surrender of Germany in early May 1945, after which she departed Brazil for Norfolk on 10 June 1945.

Conversion to press information ship

Humboldt moved to the Philadelphia Navy Yard in Philadelphia, Pennsylvania

Philadelphia, Pennsylvania

Philadelphia is the largest city in the Commonwealth of Pennsylvania and the county seat of Philadelphia County, with which it is coterminous. The city is located in the Northeastern United States along the Delaware and Schuylkill rivers. It is the fifth-most-populous city in the United States,...

, on 16 July 1945, for conversion to a press information ship. Reclassified as a miscellaneous auxiliary and redesignated AG-121 on 30 July 1945, Humboldt was to serve as a broadcast and teletype center for correspondent

Correspondent

A correspondent or on-the-scene reporter is a journalist or commentator, or more general speaking, an agent who contributes reports to a newspaper, or radio or television news, or another type of company, from a remote, often distant, location. A foreign correspondent is stationed in a foreign...

s during the planned invasion

Invasion

An invasion is a military offensive consisting of all, or large parts of the armed forces of one geopolitical entity aggressively entering territory controlled by another such entity, generally with the objective of either conquering, liberating or re-establishing control or authority over a...

 of Japan

Empire of Japan

The Empire of Japan is the name of the state of Japan that existed from the Meiji Restoration on 3 January 1868 to the enactment of the post-World War II Constitution of...

 in 1945–1946. However, hostilities with Japan ended on 15 August 1945, making the invasion unnecessary before her conversion was completed.

Post-World War II decommissioning

Humboldt was converted back into a seaplane tender and was again designated AVP-21. She arrived at Orange, Texas

Orange, Texas

Orange is a city in Orange County, Texas, United States. As of the 2000 census, the city population was 18,643. It is the county seat of Orange County, and is the easternmost city in Texas. Located on the Sabine River at the border with Louisiana, it is part of the Beaumont–Port Arthur...

, on 22 November 1945, for inactivation. She was decommissioned

Ship decommissioning

To decommission a ship is to terminate her career in service in the armed forces of her nation. A somber occasion, it has little of the elaborate ceremony of ship commissioning, but carries significant tradition....

 on 19 March 1947 and laid up in the Atlantic Reserve Fleet at Orange.

United States Coast Guard service

Loaned to the United States Coast Guard

United States Coast Guard

The United States Coast Guard is a branch of the United States Armed Forces and one of the seven U.S. uniformed services. The Coast Guard is a maritime, military, multi-mission service unique among the military branches for having a maritime law enforcement mission and a federal regulatory agency...

 on 24 January 1949, Humboldt was commissioned as the cutter

United States Coast Guard Cutter

Cutter is the term used by the United States Coast Guard for its commissioned vessels. A Cutter is or greater in length, has a permanently assigned crew, and has accommodations for the crew to live aboard...

 USCGC Humboldt (WAVP-372)

USCGC Humboldt (WAVP-372)

USCGC Humboldt , later WHEC-372, was a Casco-class United States Coast Guard Cutter in service from 1949 to 1969.-Construction and U.S. Navy service:...

 on 29 March 1949. Based at Boston, Massachusetts, and reclassified as a high endurance cutter

High endurance cutter

The designation of High endurance cutter was created in 1965 when the United States Coast Guard adopted its own designation system. High endurance cutters encompassed its largest cutters previously designated by the United States Navy as Coast Guard gunboats , Coast Guard destroyer escorts , and...

 and redesignated 'WHEC-372 on 1 May 1966, her primary duty was to patrol ocean stations in the North Atlantic, providing weather reporting services and engaging in search-and-rescue and law-enforcement

Law enforcement agency

In North American English, a law enforcement agency is a government agency responsible for the enforcement of the laws.Outside North America, such organizations are called police services. In North America, some of these services are called police while others have other names In North American...

 operations. She was transferred permanently to the Coast Guard on 26 September 1966.

Final disposition

On 30 September 1969, the Coast Guard decommissioned her and transferred her to the U.S. Navy. Stricken from the Navy List

Naval Vessel Register

The Naval Vessel Register is the official inventory of ships and service craft in custody of or titled by the United States Navy. It contains information on ships and service craft that make up the official inventory of the Navy from the time a vessel is authorized through its life cycle and...

in 1970, she was sold for scrapping in May 1970 and scrapped in Italy.