Naval Base Ulithi
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Naval Base Ulithi was a major
United States Navy The United States Navy (USN) is the naval warfare, maritime military branch, service branch of the United States Department of Defense. It is the world's most powerful navy with the largest Displacement (ship), displacement, at 4.5 millio ...
base at the Ulithi Atoll in the
Caroline Islands The Caroline Islands (or the Carolines) are a widely scattered archipelago of tiny islands in the western Pacific Ocean, to the north of New Guinea. Politically, they are divided between the Federated States of Micronesia (FSM) in the cen ...
in the western
Pacific Ocean The Pacific Ocean is the largest and deepest of Earth's five Borders of the oceans, oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean, or, depending on the definition, to Antarctica in the south, and is ...
, to the north of
New Guinea New Guinea (; Hiri Motu: ''Niu Gini''; , fossilized , also known as Papua or historically ) is the List of islands by area, world's second-largest island, with an area of . Located in Melanesia in the southwestern Pacific Ocean, the island is ...
during
World War II World War II or the Second World War (1 September 1939 – 2 September 1945) was a World war, global conflict between two coalitions: the Allies of World War II, Allies and the Axis powers. World War II by country, Nearly all of the wo ...
. The base was built to support the island-hopping
Pacific War The Pacific War, sometimes called the Asia–Pacific War or the Pacific Theatre, was the Theater (warfare), theatre of World War II fought between the Empire of Japan and the Allies of World War II, Allies in East Asia, East and Southeast As ...
efforts of the Allied nations fighting the
Empire of Japan The Empire of Japan, also known as the Japanese Empire or Imperial Japan, was the Japanese nation state that existed from the Meiji Restoration on January 3, 1868, until the Constitution of Japan took effect on May 3, 1947. From Japan–Kor ...
. In terms of the number of ships at one base, Naval Base Ulithi was the largest naval base in the world in 1944 and 1945, with over 600 ships at times.


Background

The Caroline Islands are now the
Federated States of Micronesia The Federated States of Micronesia (, abbreviated FSM), or simply Micronesia, is an island country in Micronesia, a region of Oceania. The federation encompasses the majority of the Caroline Islands (excluding Palau) and consists of four Admin ...
nation. Micronesia comprises the
Kosrae State Kosrae ( ), formerly known as Kusaie or Strong's Island, is an island in the Caroline Islands archipelago, and state within the Federated States of Micronesia. It includes the main island of Kosrae, traditionally known as Ualung (which means the ...
, Pohnpei State,
Chuuk State Chuuk State (; also known as Truk) is one of the four states of the Federated States of Micronesia (FSM). It consists of several island groups: Nomoneas, Faichuk, Faichuuk, the Hall Islands, Namonuito Atoll (Magur Islands), Pattiw (Western Isl ...
(formerly Truk) and
Yap State Yap State ( or ) is one of the four states of the Federated States of Micronesia, located in the westernmost portion of the country. The state borders Palau to the southwest, Guam to the north, and Chuuk State to the east. According to the state' ...
. After the
Spanish–American War The Spanish–American War (April 21 – August 13, 1898) was fought between Restoration (Spain), Spain and the United States in 1898. It began with the sinking of the USS Maine (1889), USS ''Maine'' in Havana Harbor in Cuba, and resulted in the ...
in 1898, the islands became a German colony and German naval base. At the start of
World War I World War I or the First World War (28 July 1914 – 11 November 1918), also known as the Great War, was a World war, global conflict between two coalitions: the Allies of World War I, Allies (or Entente) and the Central Powers. Fighting to ...
in 1914, British warships destroyed the German colonial plantation owner's radio station. On 7 October 1914, Japan invaded and took over Yap Island without a battle. Japan and Britain made a treaty giving Japan the Pacific islands north of the Equator, signed at the
Treaty of Versailles The Treaty of Versailles was a peace treaty signed on 28 June 1919. As the most important treaty of World War I, it ended the state of war between Germany and most of the Allies of World War I, Allied Powers. It was signed in the Palace ...
in 1919. In the 1930s, Japan built naval and airbases on many of the islands;
Truk Lagoon Chuuk Lagoon, previously Truk Atoll, is an atoll in the central Pacific Ocean. It lies about 1,800 kilometres (970 nautical miles) northeast of New Guinea and is part of Chuuk State within the Federated States of Micronesia (FSM). A protective ...
was the largest and strongest of these bases. By the start of World War II, Japan's Truk base had five airfields, fleet anchorage, a few seaplane bases, torpedo boat bases, repair facilities, and later a radar station. Japan also built a large base at Ponape, now
Pohnpei Pohnpei (formerly known as Ponape or Ascension, from Pohnpeian: "upon (''pohn'') a stone altar (''pei'')") is an island of the Senyavin Islands which are part of the larger Caroline Islands group. It belongs to Pohnpei State, one of the fou ...
. In that conflict, the
United States Army Air Forces The United States Army Air Forces (USAAF or AAF) was the major land-based aerial warfare service component of the United States Army and ''de facto'' aerial warfare service branch of the United States during and immediately after World War II ...
repeatedly bombed the Truk base, but it was bypassed in the
amphibious landing Amphibious warfare is a type of offensive military operation that today uses naval ships to project ground and air power onto a hostile or potentially hostile shore at a designated landing beach. Through history the operations were conducted ...
war. By February 1944, US bombers had destroyed most of Truk's military assets, and by sea, the US Navy had cut off Truk and its garrison of 5,000 Japanese troops. The US also bypassed Ponape in the
Senyavin Islands The Senyavin Islands belong to Pohnpei State in the Federated States of Micronesia. They consist of a larger volcanic Pohnpei Island (about 334 km2) and two small atolls Ant and Pakin. History On Pohnpei, pre-colonial history is divided ...
and its 8,000 troops. The US Army 81st Division landed unopposed on Ulithi on 23 September 1944; the
survey ship A survey vessel is any type of ship or boat that is used for underwater surveys, usually to collect data for mapping or planning underwater construction or mineral extraction. It is a type of research vessel, and may be designed for the pu ...
found the lagoon was well-protected and usable for fleet anchorage, with depths ranging from 80 to 100 feet. Soon, US Navy
Seabee United States Naval Construction Battalions, better known as the Navy Seabees, form the U.S. Naval Construction Forces (NCF). The Seabee nickname is a heterograph of the initial letters "CB" from the words "Construction Battalion". Dependi ...
s started work building the large base at Ulithi, taking advantage of the islands' geography: the Ulithi coral reef is about 20 miles long and 10 miles wide, with over 30 small islands (the largest island is only half a square mile in area). The four largest islands are Sorlen,
Falalop Falalop () is an island in the Ulithi Atoll in the western Pacific Ocean, approximately east of Yap. It is part of the Yap State within the Federated States of Micronesia. Overview Falalop is in area, triangular in shape, surrounded by a ...
, Asor, and Mogmog, and bases were built on all four. Japan bombed the US base at Ulithi a few times, with only marginal damage.


Base construction

Naval Base Ulithi was in use from 1944 to 1945 for staging operations and attacks on Japanese bases to the north, as part of US Naval Base Carolines. The US Navy Seabee 18th Special Battalion arrived on 1 October, followed by the 88th Naval Construction Battalion on 11 November. The Seabees did major construction on five islands of the atoll, notably including building a large fleet recreation center on Mogmog Island for 20,000 troops, docking piers, small plane airstrips,
seaplane A seaplane is a powered fixed-wing aircraft capable of takeoff, taking off and water landing, landing (alighting) on water.Gunston, "The Cambridge Aerospace Dictionary", 2009. Seaplanes are usually divided into two categories based on their tech ...
base, pontoon piers, and camps. On Mogmog Island, the Seabees built the Seabees' own base camp and Seabee supply depot. On Sorlen Island, they constructed a 1,600-place theatre, a large landing craft camp, 1,600-man
mess hall The mess (also called a mess deck aboard ships) is a designated area where military personnel socialize, eat and (in some cases) live. The term is also used to indicate the groups of military personnel who belong to separate messes, such as the o ...
, Naval headquarters, Marine aviation camp and 100-bed Naval hospital. Over 9,000 men were stationed at the base to run the operations. The Seabee 58th Naval Construction Battalion did R&R at Ulithi before departing to
Okinawa Island , officially , is the largest of the Okinawa Islands and the Ryukyu Islands, Ryukyu (''Nansei'') Islands of Japan in the Kyushu region. It is the smallest and least populated of the five Japanese archipelago, main islands of Japan. The island is ...
. After Typhoon Cobra in December 1944, Naval Base Ulithi sent out ships to pick up survivors of ships that had sunk in the storm. Some ships that were damaged in the storm were also repaired at Ulithi. Ulithi had a large fleet anchorage used for staging and repair of ships. The Seabees built an airbase to support half of a night fighter squadron, a utility squadron, and a light inshore patrol squadron. At the airbase, the Navy kept up to 150 aircraft fighter planes to replace any lost on
aircraft carrier An aircraft carrier is a warship that serves as a seagoing airbase, equipped with a full-length flight deck and hangar facilities for supporting, arming, deploying and recovering carrier-based aircraft, shipborne aircraft. Typically it is the ...
s. Staging facilities for transport aircraft were constructed. A large camp was built for the maintenance crews of planes and ships. A camp was built to house crews of ships under repair. A supply depot was built to support the ships, planes, and troops at Ulithi. Most supplies like fuel, ammunition, and spare parts were stored in cargo ships in the atoll and unloaded as needed. Seabees handled over 20,000 tons of cargo per month. The 18th Special departed 25 May 1945 to Leyte-Samar Naval Base. On 10 October 1944, part of the 6th Special Battalion arrived at Ulithi for unloading and loading of ships, with the 6th handling over 12,000 tons of cargo per month. The 6th departed in June 1945, ending its work. The 51st Battalion arrived on 8 October 1944 and widened, lengthened, and improved Falalop Airfield. A 3,500-by-150-foot fighter runway was built. The 51st also built a fuel tank frame and fuel pier. On 16 April 1945, the Seabee Naval Construction Battalion Detachment 1044 arrived. Most of the 1044th worked on damage control and repair sections at the base. The 1044 departed 25 July 1945, ending their work. The 88th Naval Construction Battalion departed Ulithi on 7 February 1945 and arrived at Bobon,
Samar Samar ( ) is the third-largest and seventh-most populous island in the Philippines, with a total population of 1,909,537 as of the 2020 census. It is located in the eastern Visayas, which are in the central Philippines. The island is divided in ...
, Philippine Islands on 10 February. There, they built a
PT boat A PT boat (short for patrol torpedo boat) was a motor torpedo boat used by the United States Navy in World War II. It was small, fast, and inexpensive to build, and it was valued for its maneuverability and speed. However, PT boats were hampe ...
repair base as part of the Leyte-Samar Naval Base. On 8 November 1944, Naval Construction Maintenance Unit 603 arrived to do general maintenance of the airstrip. The Fleet Post Office at Ulithi was #3011. When Leyte-Samar Naval Base was completed, much of the operation at Ulithi was transferred to it, departing on 7 May 1945. During its operation, the base also supported the nearby
Naval Base Kossol Roads file:Palau on the globe (Southeast Asia centered) (small islands magnified).svg, Palau on the globe, Kossol Roads is at the north end of islands in redNaval Base 1944–1945 Naval Base Kossol Roads also called Naval Base Kossol Passage was a ...
.


Fleet support

The
United States Fifth Fleet The Fifth Fleet is a numbered fleet of the United States Navy. Its area of responsibility encompasses approximately 2.5 million square miles, and includes the Persian Gulf, Red Sea, Arabian Sea, and parts of the Indian Ocean. It shares a comma ...
used Ulithi for staging major operations, including the Philippines campaign,
Operation Hailstone Operation Hailstone was a large-scale United States Navy air and surface attack on Truk Lagoon on 17–18 February 1944, conducted as part of the American offensive drive against the Imperial Japanese Navy in the Pacific Ocean theatre of Worl ...
and the troop landings at Okinawa. In March 1945 106 destroyers, 29 aircraft carriers, 15 battleships, and 23 cruisers departed for Okinawa. The base was kept secret until found by Japan, and Japan attacked the Fifth Fleet at Ulithi in
Operation Tan No. 2 Operation Tan No. 2 (, ''Dainiji Tan Sakusen'') was a long-range ''kamikaze'' mission directed at the main Allied naval fleet anchorage at Ulithi Atoll in the western Pacific on 11 March 1945 during the Pacific campaign of World War II. The ...
on 11 March 1945 using long-range
kamikaze , officially , were a part of the Japanese Special Attack Units of military aviators who flew suicide attacks for the Empire of Japan against Allied naval vessels in the closing stages of the Pacific campaign of World War II, intending to d ...
. In October 1944 a carrier battle group from
Task Force 38 The Fast Carrier Task Force (TF 38 when assigned to Third Fleet, TF 58 when assigned to Fifth Fleet) was a group of ships in World War II. It was the main striking force of the United States Navy in the Pacific War from January 1944 through th ...
of the
United States Third Fleet The United States Third Fleet is one of the numbered fleets in the United States Navy. Third Fleet's area of responsibility includes approximately fifty million square miles of the eastern and northern Pacific Ocean areas including the Bering ...
under William Halsey arrived at Ulithi for resupply. Murderers' Row was the nickname given to the Third Fleet's aircraft carriers at anchor in a row at Ulithi. In the row were , , , , and . After the Third Fleet was hit by Typhoon Cobra in December 1944, it ported in Ulithi. The typhoon, which became known as Halsey's Typhoon, caused heavy damage to the ships, the sinking of three destroyers, and the loss of 146 aircraft. The destroyers lost were the , , and ; in total, 790 crewmen died. As a result, court of inquiry was held aboard the
destroyer tender A destroyer tender or destroyer depot ship is a type of depot ship: an auxiliary ship designed to provide maintenance support to a flotilla of destroyers or other small warships. The use of this class has faded from its peak in the first half of ...
on 26 December to determine if Halsey should be sanctioned for sailing into the typhoon. The court found "errors in judgment committed under stress of war operations and stemming from a commendable desire to meet military requirements".


Attacks on the base

Japanese navy forces made several attacks on Ulithi, which represented an important strategic target, with over 100,000 barrels of fuel oil stored at Ulithi in tanker ships and land depots. Naval Base Ulithi also supported a number of other smaller bases in the Naval Base Carolines. On 20 November 1944, the fleet oiler was hit at Ulithi by a Japanese ''
kaiten were crewed torpedoes and suicide attack, suicide craft, used by the Imperial Japanese Navy in the final stages of World War II. Background In recognition of the unfavorable progress of the war, towards the end of 1943 the Japanese high co ...
''-manned torpedo; the ship exploded and sank, with a loss of 63 crew members. However, four other kaiten did not hit any other ships. On 11 March 1945, the
Operation Tan No. 2 Operation Tan No. 2 (, ''Dainiji Tan Sakusen'') was a long-range ''kamikaze'' mission directed at the main Allied naval fleet anchorage at Ulithi Atoll in the western Pacific on 11 March 1945 during the Pacific campaign of World War II. The ...
''kamikaze'' raid took off from Kanoya Air Field to attack Ulithi. The ''kamikaze'' aircraft hit in a nighttime raid on Ulithi, striking on her stern starboard side; ''Randolph'' lost 27 men and 105 were wounded. However, ''Randolph'' was quickly repaired at Ulithi and put back in service. Japan planned a major submarine attack on Ulithi, but it was canceled with the
surrender of Japan The surrender of the Empire of Japan in World War II was Hirohito surrender broadcast, announced by Emperor Hirohito on 15 August and formally Japanese Instrument of Surrender, signed on 2 September 1945, End of World War II in Asia, ending ...
in September 1945, while the submarines were en route. With the news of surrender, the I-400 fleet returned to Japan.


Facilities


Airfields

* Falalop Airfield, now
Ulithi Airport Ulithi Civil Airfield is a public airport serving the island of Falalop, located in the Ulithi Atoll in the Caroline Islands, Federated States of Micronesia. It was previously Falalop Airfield or Naval Air Base Ulithi (NAB Ulithi), when used a ...
, on Falalop Island, built by Japan, but abandoned, improved by Navy Seabees. A single runway spanning the entire width of the island. US Marine Air Group 45 (MAG-45), VMSB-24, and Service Squadron 45 with its headquarters were stationed at Falalop. MAG-45 and VMSB-24 flew missions to Japan's bases on Yap Island, Fais Island and Sorol Island, with their
Grumman TBF Avenger The Grumman TBF Avenger (designated TBM for aircraft manufactured by General Motors) is an American World War II-era torpedo bomber developed initially for the United States Navy and Marine Corps, and eventually used by several air and naval a ...
,
Grumman F6F Hellcat The Grumman F6F Hellcat is an American Carrier-based aircraft, carrier-based fighter aircraft of World War II. Designed to replace the earlier Grumman F4F Wildcat, F4F Wildcat and to counter the Japanese Mitsubishi A6M Zero, it was the United St ...
and
Curtiss SB2C Helldiver The Curtiss SB2C Helldiver was a dive bomber developed by Curtiss-Wright during World War II. As a carrier-based bomber with the United States Navy (USN), in Pacific theaters, it supplemented and replaced the Douglas SBD Dauntless. A few su ...
. MAG-45 also flew anti-submarine patrols to protect Ulithi. The Marine Avengers sank two of the midget subs, only one sank a ship, a US Navy oiler at Ulithi. *Sorlen Airfield on Sorlen Island, Built by Seabees, an airfield for light aircraft. Started 12 December 1944, and completed January 27, 1945. *Mogmog Airfield, light aircraft, built on Mogmog Island to support the Mogmog Island Seabee camp and the Mogmog Island recreation center. Seabess started building on 12 December 1944 and completed on 27 January 1945. **At the three airfields the Navy kept up to 150 aircraft fighters to replace any lost on aircraft carriers. *Mogmog seaplane base, a floating seaplane base, supported by seaplane tenders. *Falalop Seaplane base on Falalop Island and in the atoll. Falalop Island base built starting 4 November 1944 and completed 5 December 1944 * Fais Airfield is to the east of Ulithi by 87 km (54 miles) on Fais Island. Ulithi supported the 3,000 feet runway built there in 1945. The runway was mostly used as an emergency landing strip.


LORAN station

The
United States Coast Guard The United States Coast Guard (USCG) is the maritime security, search and rescue, and Admiralty law, law enforcement military branch, service branch of the armed forces of the United States. It is one of the country's eight Uniformed services ...
built a
LORAN LORAN (Long Range Navigation) was a hyperbolic navigation, hyperbolic radio navigation system developed in the United States during World War II. It was similar to the UK's Gee (navigation), Gee system but operated at lower frequencies in order ...
(Long Range Navigational Signal) station at Ulithi in December 1944 and operated the station on Potoangroas Island till February 1945. For the
Korean War The Korean War (25 June 1950 – 27 July 1953) was an armed conflict on the Korean Peninsula fought between North Korea (Democratic People's Republic of Korea; DPRK) and South Korea (Republic of Korea; ROK) and their allies. North Korea was s ...
the LORAN station was moved to Falalop Island near the Falalop Airfield, as Potoangroas Island was only resupplied by sea, and in rough weather there was no resupply. The Ulithi LORAN Station was closed in February 1962 and moved to Yap Island. In 1978 the
Global Positioning System The Global Positioning System (GPS) is a satellite-based hyperbolic navigation system owned by the United States Space Force and operated by Mission Delta 31. It is one of the global navigation satellite systems (GNSS) that provide ge ...
replaced the need for LORAN.


Mogmog Island

US Navy Seabees turned the swamps and forest on Mogmog Island (Mog Mof) into a large Ulithi fleet recreation center. The Seabees built the Ulithi Seabees camp with barracks and depot. At the depot Seabees stored all the supplies and gear needed to build and maintain the base at Ulithi. The Mogmog Island recreation center had a
bandstand A bandstand (sometimes music kiosk) is a circular, semicircular or polygonal structure set in a park, garden, pier, or indoor space, designed to accommodate musical bands performing concerts. A simple construction, it both creates an ornamen ...
, a refreshment center, a 1,200-seat theatre with a 25-by-40-foot stage, a sport center with 4 baseball diamonds and 200-seat chapel. The recreation center could house up to 8,000 men and 1,000 officers daily. Mogmog Island had a large recreation beach resort for those on leave. The Navy had an ice cream barge that could make up to 500 gallons of ice cream for the troops in 8 hours. The barge would also make fresh bread products. The base officer's and chief petty officer's club was built on Mogmog Island. Mogmog Airfield was constructed for light aircraft for short trips to the other nearby islands. Off the shore of Mogmog Island in the atoll was the Mogmog floating seaplane base, supported by seaplane tenders.


Asor Island

Naval Base Ulithi headquarters and the military cemetery were built on Asor Island. The 6th Special Naval Construction Battalion was in charge of most burial details. The 63 men lost during the attack on the USS Mississinewa AO-59, were given interment at Ulithi cemetery, as were some of those lost on the USS Franklin. After the war the cemetery was closed as the troops were reinterred in new, permanent cemeteries in the states.


Sorlen Island

On Sorlen Island a second and small fleet recreation center was built. The main part of the recreation center was the 1,600 seat movie theater. A distillation center and 5,000-gallon storage tanks system was built to make freshwater. While the US Marine fighter base was on Falalop Island, a camp for Marine aviation was built on Sorlen Island, with barrack and mess halls. Naval Base Ulithi has many landing craft used to move gear and personal from ship to ship and ship to shore. On Sorlen Island a large landing craft camp was built. The Fifth Fleet and Third Fleet had hundreds of landing craft used in amphibious landings, that also use the camp and depot for maintaining the crafts when needed. A quonset naval hospital was constructed on Sorlen Island with a 100-bed unit. A power plant was built to supply electricity. Seabees built the Sorlen Airfield for small plane use.


Submarine base

Many US Navy
submarine A submarine (often shortened to sub) is a watercraft capable of independent operation underwater. (It differs from a submersible, which has more limited underwater capability.) The term "submarine" is also sometimes used historically or infor ...
s were used in the Pacific War. The submarines attacked
warship A warship or combatant ship is a naval ship that is used for naval warfare. Usually they belong to the navy branch of the armed forces of a nation, though they have also been operated by individuals, cooperatives and corporations. As well as b ...
s and sank supply ships that were needed by Japan to resupply their many bases in the Pacific. US subs also did reconnaissance patrols, landed
guerrilla Guerrilla warfare is a form of unconventional warfare in which small groups of irregular military, such as rebels, Partisan (military), partisans, paramilitary personnel or armed civilians, which may include Children in the military, recruite ...
special forces Special forces or special operations forces (SOF) are military units trained to conduct special operations. NATO has defined special operations as "military activities conducted by specially designated, organized, selected, trained and equip ...
and
search and rescue Search and rescue (SAR) is the search for and provision of aid to people who are in distress or imminent danger. The general field of search and rescue includes many specialty sub-fields, typically determined by the type of terrain the search ...
missions for downed aircrew men. US submarines had long ranges, but needed to be resupplied with fuel, food,
torpedo A modern torpedo is an underwater ranged weapon launched above or below the water surface, self-propelled towards a target, with an explosive warhead designed to detonate either on contact with or in proximity to the target. Historically, such ...
es and
deck gun A deck gun is a type of naval artillery mounted on the deck of a submarine. Most submarine deck guns were open, with or without a shield; however, a few larger submarines placed these guns in a turret. The main deck gun was a dual-purpose w ...
shells. At Naval Base Ulithi the Navy set up a floating submarine base in the
atoll An atoll () is a ring-shaped island, including a coral rim that encircles a lagoon. There may be coral islands or cays on the rim. Atolls are located in warm tropical or subtropical parts of the oceans and seas where corals can develop. Most ...
. The
submarine tender A submarine tender, in British English a submarine depot ship, is a type of depot ship that supplies and supports submarines. Development Submarines are small compared to most oceangoing vessels, and generally cannot carry large amounts of foo ...
s USS Sperry (AS-12) and USS Sumner (AGS-5) were stationed in the atoll to supply the submarines. While the submarine was being resupplied, and repaired if needed, crews could have a break ( R&R) at the Ulithi's fleet recreation center on Mogmog Island. Some of the subs stationed at the base were: USS Albacore (SS-218), USS Skate (SS-305), and USS Flying Fish (SS-229),


Repair depot

The US Navy set up a large ship and boat repair depot at Naval Base Ulithi. The repair depot provided the fleet with support to keep
ship A ship is a large watercraft, vessel that travels the world's oceans and other Waterway, navigable waterways, carrying cargo or passengers, or in support of specialized missions, such as defense, research and fishing. Ships are generally disti ...
s and subs tactically available in the Pacific War with the repair and supply depot, rather than ships having to return to
continental United States The contiguous United States, also known as the U.S. mainland, officially referred to as the conterminous United States, consists of the 48 adjoining U.S. states and the District of Columbia of the United States in central North America. The te ...
. The Navy had built special
auxiliary floating drydock An auxiliary floating drydock is a type of US Navy List of auxiliaries of the United States Navy, auxiliary Dry dock#Floating, floating dry dock. Floating dry docks are able to submerge underwater and to be placed under a ship in need of repai ...
s that were able to repair battle damage to even the largest ships and do regular maintenance in the field saving ships trans-pacific travel time for repair. Supply store ships were also at the base with the parts needed to keep the fleet ready. The most noted ship repaired at the depot was the
USS Franklin (CV-13) USS ''Franklin'' (CV/CVA/CVS-13, AVT-8), nicknamed "Big Ben," was one of 24 s built during World War II for the United States Navy, and the fifth US Navy ship to bear the name. Commissioned in January 1944, she served in several campaigns in th ...
. The USS Franklin on 19 March 1945 was hit by Japanese bombs off Okinawa. Fire and explosions damaged the ship, killing and wounding many. The crew was able to save the badly damaged ship. Under her own power, she made it to Ulithi repair depot for emergency repairs before going to the
Brooklyn Navy Yard The Brooklyn Navy Yard (originally known as the New York Navy Yard) is a shipyard and industrial complex in northwest Brooklyn in New York City, New York (state), New York, U.S. The Navy Yard is located on the East River in Wallabout Bay, a se ...
for a year-long complete rebuild. The USS Houston (CL-81) and USS Reno (CL-96) also had emergency repairs at Ulithi.
USS Hancock (CV-19) USS ''Hancock'' (CV/CVA-19) was one of 24 s built during World War II for the United States Navy. ''Hancock'' was the fourth US Navy ship to bear the namesake of Founding Fathers of the United States, Founding Father John Hancock, president o ...
and
USS Ticonderoga (CV-14) USS ''Ticonderoga'' (CV/CVA/CVS-14) was one of 24 s built during World War II for the United States Navy. The ship was the fourth US Navy ship to bear the name, and was named after the capture of Fort Ticonderoga in the American Revolutionary W ...
were repaired at the base after kamikaze attacks. The USS Bennington (CV-20) was repaired with a badly damaged flight deck from Typhoon Cobra. *Some of the Ulithi repair depot ships and crafts: * USS AFDB-2, very large Auxiliary floating drydock able to repair
battleship A battleship is a large, heavily naval armour, armored warship with a main battery consisting of large naval gun, guns, designed to serve as a capital ship. From their advent in the late 1880s, battleships were among the largest and most form ...
s * USS Richland (YFD-64), Auxiliary floating drydock * USS Oak Ridge (ARDM-1), Auxiliary floating drydock * USS Endurance (ARDM-3), Auxiliary floating drydock *AFDL-32, a type of Small Auxiliary Floating Dry Docks *USS ARD-13, ARD Auxiliary floating drydock, mostly destroyer repair *USS ARD-15, ARD Auxiliary floating drydock, mostly destroyer repair *USS ARD-23, ARD Auxiliary floating drydock, mostly destroyer repair * USS Jason (AR-8), large repair ship * USS Ajax, large repair ship * USS Nestor (ARB-6), repair ship and small craft tender *
USS Oceanus (ARB-2) USS ''Oceanus'' (ARB-2) was planned as a United States Navy , but was redesignated as one of twelve ''Aristaeus''-class battle damage repair ships built for the United States Navy during World War II. Named for Oceanus (believed to be the worl ...
, battle damage repair ship * USS Vestal, large repair ship * USS Mona Island (ARG-9), repair ship and
flagship A flagship is a vessel used by the commanding officer of a group of navy, naval ships, characteristically a flag officer entitled by custom to fly a distinguishing flag. Used more loosely, it is the lead ship in a fleet of vessels, typically ...
for MinRon 10 * USS Deliver (ARS-23),
rescue and salvage ship Rescue and salvage ships (hull classification symbol ARS) are a type of military salvage tug. They are tasked with coming to the aid of stricken vessels. Their general mission capabilities include combat salvage, lifting, towing, retraction of grou ...
* USS Shackle (ARS-9), rescue and salvage ship * USS Supply (IX-147), aircraft stores ship *YRB-34, Floating Workshop


Seaplane bases

The US Navy set up a two large seaplane base at Naval Base Ulithi, Falalop seaplane base and Mogmog seaplane base. Seaplanes did reconnaissance patrols and search, also rescue missions for downed aircrew mem and survivors of sunk ships. The most common seaplanes at the base were
Consolidated PBY Catalina The Consolidated Model 28, more commonly known as the PBY Catalina (U.S. Navy designation), is a flying boat and amphibious aircraft designed by Consolidated Aircraft in the 1930s and 1940s. In U.S. Army service, it was designated as the OA- ...
and
Martin PBM Mariner The Martin PBM Mariner is a twin-engine American Maritime patrol aircraft, patrol bomber flying boat of World War II and the early Cold War era. It was designed to complement the Consolidated PBY Catalina and Consolidated PB2Y Coronado, PB2Y C ...
. The Mogmog seaplane base take off and landing was a spot marked in the atoll off the fleet recreation center on Mogmog Island. The seaplanes were supported by a floating base of
seaplane tender A seaplane tender is a boat or ship that supports the operation of seaplanes. Some of these vessels, known as seaplane carriers, could not only carry seaplanes but also provided all the facilities needed for their operation; these ships are rega ...
s. The second seaplane base was on Falalop Island. On Falalop Island a seaplane ramp was constructed by the Seabees at one end of Falalop airfield. The seaplane ramp extended from the extreme low tide mark to the seaplane parking hardstand. The Falalop seaplane base was completed on 5 December 1944. Seaplane tenders and land base had stores to supply: food, fuel, ammo, spare parts. The seaplane tender also had housing and mess halls for the aircrew while the seaplane was being serviced. Aircrew on leave could go to Ulithi's fleet recreation center on Mogmog Island. Some seaplane tenders were stationed at Ulithi seaplane base for months. Other seaplane tenders came to Naval Base Ulithi to resupply the ship's stores before returning to a US Naval Advance Base. Some came to Ulithi repair depot to be repaired. Some seaplane tenders at Naval Base Ulithi: * USS Corson (AVP-37) * USS Hamlin (AV-15) * USS Casco (AVP-12) * USS Suisun * USS Chandeleur (AV-10) * USS Mackinac (AVP-13) * USS Barataria (AVP-33) *
USS Chincoteague (AVP-24) USS ''Chincoteague'' (AVP-24) was a United States Navy seaplane tender in commission from 1943 to 1946 that saw service in the Pacific during World War II. After the war, she was in commission in the United States Coast Guard as the cutter USC ...
* USS Kenneth Whiting (AV-14) * USS Onslow (AVP-48) * USS Pocomoke (AV-9) * USS St. George (AV-16) * USS Duxbury Bay (AVP-38) * USS San Pablo (AVP-30) * USS Yakutat (AVP-32) * USS Cumberland Sound (AV-17) * USS Shelikof (AVP-52) * USS Coos Bay *YSD-42 Seaplane Wrecking
Derrick A derrick is a lifting device composed at minimum of one guyed mast, as in a gin pole, which may be articulated over a load by adjusting its Guy-wire, guys. Most derricks have at least two components, either a guyed mast or self-supporting tower ...
*UN Navy seaplane Squadrons based at Ulithi seaplane base: *
VPB-13 VPB-13 was a patrol bombing squadron of the U.S. Navy. The squadron was established as Patrol Squadron 13 (VP-13) on 1 July 1940, redesignated Patrol Bombing Squadron 13 (VPB-13) on 1 October 1944 and disestablished on 1 December 1945. Operati ...
with Consolidated PB2Y Coronado * VPB-17 with Martin PBM Mariner * VPB-18 with Martin PBM Mariner * VPB-20 with Martin PBM Mariner *
VPB-23 VPB-23 was a patrol bombing squadron of the U.S. Navy. The squadron was established as Patrol Squadron 10-S (VP-10S) on 1 July 1930, redesignated Patrol Squadron 10-F (VP-10F) on 17 July 1933, redesignated Patrol Squadron 10 (VP-10) on 1 October ...
with Consolidated PBY Catalina * VP-41 with Martin PBM Mariner *
VP-42 VP-42 was a Patrol Squadron of the U.S. Navy. The squadron was established as Patrol Squadron 22 (VP-22) on 7 April 1944, redesignated Patrol Bombing Squadron 22 (VPB-22) on 1 October 1944, redesignated Patrol Squadron 22 (VP-22) on 15 May 1946, ...
with Martin PBM Mariner *
VP-48 VP-48 was a Patrol Squadron of the U.S. Navy. It was established as VP-208 on 15 December 1942, redesignated Patrol Bombing Squadron VPB-208 on 1 October 1944, redesignated VP-208 on 15 May 1946, redesignated Medium Patrol Squadron (Seaplane) ...
with Martin PBM Mariner * VPB-202 with Martin PBM Mariner


Submarine chaser base

To help protect the base and shipping around the base, Naval Base Ulithi had a fleet of
submarine chaser A submarine chaser or subchaser is a type of small naval vessel that is specifically intended for anti-submarine warfare. They encompass designs that are now largely obsolete, but which played an important role in the wars of the first half of th ...
s. The submarine chasers were supported by a submarine chaser tender ship: the USS Mindanao (ARG-3) was stationed at Ulithi to support the fleet of submarine chasers and some crash boats. crash boats were fast boats use to rescue downed airmen. Some of the submarine chasers served at Ulithi:
USS PC-1137 USS ''PC-1137'' was a built for the United States Navy during World War II. After World War II, the ship was renamed USS ''PCC-1137','' reflecting her new role as a combat communications control ship. Later, in 1956, she was renamed ''Worthin ...
,
USS PC-598 The USS ''PC-598'' was a 173ft (approx. 54m) metal hulled in the United States Navy. The submarine chaser fought in the Pacific War, Pacific Theatre during World War II, and was converted to an amphibious landing control vessel during the war, ...
,
USS PC-1136 USS ''PC-1136'' was a built for the United States Navy during World War II. Shortly after the end of the war, she was renamed USS ''PCC-1136'' when she was reclassified as a combat communications control ship. In 1956, she was renamed ''Galena' ...
,
USS PGM-18 USS ''PGM-18'' was a built for the United States Navy during World War II. She was built and originally commissioned as USS ''PC-1255'', a , and was decommissioned and converted in late 1944. USS PGM-18 struck a mine off the coast of Okinawa ...
, and USS PC-1138.


Destroyer base

Hundreds of US Navy
destroyer In naval terminology, a destroyer is a fast, maneuverable, long-endurance warship intended to escort larger vessels in a fleet, convoy, or carrier battle group and defend them against a wide range of general threats. They were conceived i ...
s were used in the Pacific war. Destroyers were used to protect
capital ship The capital ships of a navy are its most important warships; they are generally the larger ships when compared to other warships in their respective fleet. A capital ship is generally a leading or a primary ship in a naval fleet. Strategic i ...
s like
aircraft carrier An aircraft carrier is a warship that serves as a seagoing airbase, equipped with a full-length flight deck and hangar facilities for supporting, arming, deploying and recovering carrier-based aircraft, shipborne aircraft. Typically it is the ...
s,
battleship A battleship is a large, heavily naval armour, armored warship with a main battery consisting of large naval gun, guns, designed to serve as a capital ship. From their advent in the late 1880s, battleships were among the largest and most form ...
s and
heavy cruiser A heavy cruiser was a type of cruiser, a naval warship designed for long range and high speed, armed generally with naval guns of roughly 203 mm (8 inches) in calibre, whose design parameters were dictated by the Washington Naval Treat ...
s. Destroyers were used to screen and protect convoy of ships. Destroyers were used to hunt submarines and protect
amphibious landing Amphibious warfare is a type of offensive military operation that today uses naval ships to project ground and air power onto a hostile or potentially hostile shore at a designated landing beach. Through history the operations were conducted ...
s at beaches. Destroyers had
anti-aircraft Anti-aircraft warfare (AAW) is the counter to aerial warfare and includes "all measures designed to nullify or reduce the effectiveness of hostile air action".AAP-6 It encompasses surface-based, subsurface ( submarine-launched), and air-ba ...
guns,
radar Radar is a system that uses radio waves to determine the distance ('' ranging''), direction ( azimuth and elevation angles), and radial velocity of objects relative to the site. It is a radiodetermination method used to detect and track ...
, and forward-launched ASW weapons,
dual-purpose gun A dual-purpose gun is a naval artillery mounting designed to engage both surface and air targets. Description Second World War-era capital ships had four classes of artillery: the heavy main battery, intended to engage opposing battleships and ...
s,
depth charge A depth charge is an anti-submarine warfare (ASW) weapon designed to destroy submarine A submarine (often shortened to sub) is a watercraft capable of independent operation underwater. (It differs from a submersible, which has more limited ...
s, and torpedoes. Like the submarines, they needed to be restocked with food, fuel, supplies, and
weapons A weapon, arm, or armament is any implement or device that is used to deter, threaten, inflict physical damage, harm, or kill. Weapons are used to increase the efficacy and efficiency of activities such as hunting, crime (e.g., murder), law ...
to be kept operational. Ulithi had a large destroyer base, with
destroyer tender A destroyer tender or destroyer depot ship is a type of depot ship: an auxiliary ship designed to provide maintenance support to a flotilla of destroyers or other small warships. The use of this class has faded from its peak in the first half of ...
s. Destroyer tenders could do minor repair work on the ships also, and major work could be done at the Ulithi repair depot. Destroyer tenders stationed at Ulithi: * USS Cascade (AD-16) * USS Prairie (AD-15) *
USS Piedmont (AD-17) USS ''Piedmont'' (AD–17) was a built during World War II for the United States Navy. Her task was to service destroyers in, or near, battle areas and to keep them fit for duty. She served in the Pacific Ocean during World War II, the Cold Wa ...
* USS Yosemite (AD-19) * USS Hamul (AD-20) to support Okinawa campaign damage * USS Dixie (AD-14) September 1944 to February 1945 * USS Sierra (AD-18) 15 March 1945 to 25 May 1945 * USS Markab


Floating hospital

For four months (March to June) in 1945 Naval Base Ulithi was used as a major forward Naval hospital. US Navy
Hospital ship A hospital ship is a ship designated for primary function as a floating healthcare, medical treatment facility or hospital. Most are operated by the military forces (mostly navy, navies) of various countries, as they are intended to be used in or ...
s were stationed Naval Base Ulithi during parts of the war and some were stationed shortly as they joined staging for upcoming invasions. Hospital ships also were able to resupply and refuel at the base. * USS Relief (AH-1), 550-beds, stationed at Ulithi two times, received wounded from USS Randolph. * USS Mercy (AH-8), up to 400 patients, stationed at Ulithi 5th Fleet to care for wounded from
Battle of Okinawa The , codenamed Operation Iceberg, was a major battle of the Pacific War fought on the island of Okinawa Island, Okinawa by United States Army and United States Marine Corps forces against the Imperial Japanese Army during the Pacific War, Impe ...
. *
USS Samaritan (AH-10) USS ''Samaritan'' (AH-10) was a hospital ship that served with the US Navy in World War II. Prior to that, she served as a US Navy transport ship under the name USS ''Chaumont'' (AP-5). USS ''Chaumont'', one of twelve 13,400-ton (displacement) H ...
up to 394 patients, stationed at Ulithi two times. * USS Rescue (AH-18) up to 800 patients, was stationed at Ulithi in March 1945 before going to Okinawa. * USS Solace (AH-5) up to 418 patients, stationed at Ulithi two times, was stationed at Ulithi in March 1945 before going to Okinawa. * USS Tranquillity (AH-14) up to 802 patients, stationed at Ulithi near the end of war, departed Ulithi to help survivors from the
USS Indianapolis (CA-35) USS ''Indianapolis'' (CL/CA-35) was a heavy cruiser of the United States Navy, named for the city of Indianapolis, Indiana. Launched in 1931, she was the flagship of the commander of Scouting Force 1 for eight years, then flagship for Admira ...
sinking. * USS Hope (AH-7), up to 400 patients, was stationed shortly at Ulithi in March 1945 before going to Okinawa. * USS Bountiful (AH-9) up to 477 patients, stationed at Ulithi with Okinawa and
Battle of Iwo Jima The was a major battle in which the United States Marine Corps (USMC) and United States Navy (USN) landed on and eventually captured the island of Iwo Jima from the Imperial Japanese Army (IJA) during World War II. The American invasion, desi ...
patients.


Net laying

To protect the many ships at Ulithi the Navy had 1,260 yards of anti-torpedo net installed in the Towachi Channel and 6,390 yards at other inlets to the atoll. The ship USS Tuscana (AKN-3) supplied the nets. *
Net laying ship 300px, , an American net laying ship that worked at Pearl Harbor in the 1940s A net laying ship, also known as a net layer, net tender, gate ship or boom defence vessel was a type of naval auxiliary ship. A net layer's primary function was to l ...
s stationed at Ulithi * USS Viburnum (AN-57) hit a mine while working on 28 October 1944, was repaired at the base. * USS Anaqua * USS Snowbell (AN-52) * USS Rosewood (AN-31) * USS Cornel (AN-45)


Stationed at Ulithi

*Over 6,000 seamen were at Ulithi, stationed in ships and on shore bases. On 13 March 1945, there were 647 ships at anchor at Ulithi, some stationed, some in for repair or resupply. Just before the departure of the fleet to
Okinawa most commonly refers to: * Okinawa Prefecture, Japan's southernmost prefecture * Okinawa Island, the largest island of Okinawa Prefecture * Okinawa Islands, an island group including Okinawa itself * Okinawa (city), the second largest city in th ...
there were 722 ships at Ulithi. United States Merchant Navy ships also were unloaded at Naval Base Ulithi to keep the fleet and base supplied. *
Service Squadron A Service Squadron (ServRon) was a United States Navy squadron that supported fleet combat ships and US Navy Auxiliary ships. Service Squadrons were used by the US Navy from their inception in 1943 to as late as the early 1980s. At the time of t ...
10, a floating 400 ship base with tankers, Fleet oilers,
refrigerator A refrigerator, commonly shortened to fridge, is a commercial and home appliance consisting of a thermal insulation, thermally insulated compartment and a heat pump (mechanical, electronic or chemical) that transfers heat from its inside to ...
ships,
ammunition ship An ammunition ship is an auxiliary ship specially configured to carry ammunition, usually for naval ships and aircraft. An ammunition ship's cargo handling systems, designed with extreme safety in mind, include ammunition hoists with airlocks bet ...
s, supply ships, floating docks and
repair ship A repair ship is a naval auxiliary ship designed to provide maintenance support to warships. Repair ships provide similar services to destroyer, submarine and seaplane tenders or depot ships, but may offer a broader range of repair capability incl ...
s. Service Squadron 10 started departing
Enewetak Atoll Enewetak Atoll (; also spelled Eniwetok Atoll or sometimes Eniewetok; , , or , ; known to the Japanese as Brown Atoll or Brown Island; ) is a large coral atoll of 40 islands in the Pacific Ocean and with its 296 people (as of 2021) forms a leg ...
4 October 1944 for Ulithi arriving on the 15th. * USS Abatan,
distilling ship Distillation, also classical distillation, is the process of separating the component substances of a liquid mixture of two or more chemically discrete substances; the separation process is realized by way of the selective boiling of the mixt ...
freshwater from the sea for land base and small vessels. * USS Dauphin (APA-97), floating barracks,
troopship A troopship (also troop ship or troop transport or trooper) is a ship used to carry soldiers, either in peacetime or wartime. Troopships were often drafted from commercial shipping fleets, and were unable to land troops directly on shore, typic ...
* USS Amador, ammunition tender * USS Firedrake (AE-14), ammunition tender * USS Lassen (AE-3), ammunition tender stores *SS Plymouth Victory, ammunition stores *
USS Turkey (AM-13) USS ''Turkey'' (AM-13) was a the United States Navy, thus named after the bird, not after the country which in 1917 was an enemy in the ongoing World War I. The minesweeper was acquired by for the dangerous task of removing mines from minefiel ...
,
minesweeper A minesweeper is a small warship designed to remove or detonate naval mines. Using various mechanisms intended to counter the threat posed by naval mines, minesweepers keep waterways clear for safe shipping. History The earliest known usage of ...
* USS Sabine (AO-25), carrier oiler * USS Aucilla, carrier oiler * USS Marias (AO-57), battleship oiler *
USS Platte (AO-24) USS ''Platte'' (AO-24) was a oiler serving with the United States Navy, named for the 1836 Platte Purchase that included the Platte Rivers in Iowa, Missouri and Nebraska. Her memorial in Platte County, Missouri honors all four rivers that sha ...
, battleship oiler * USS Taluga (AO-62), cruisers oiler * USS Sepulga (AO-20), cruisers oiler * USS Cowanesque (AO-79), destroyer oiler * USS Chotauk (IX-188), destroyer oiler * USS Elk (IX-115), destroyer oiler *USS Malvern (IX-138), destroyer oiler * USS Genesee (AOG-8), oiler * USS Enoree (AO-69), oiler * USS Nantahala (AO-60), oiler * USS Tombigbee (AOG-11), oiler * USS Saranac (AO-74), oiler * USS Neosho (AO-48), oiler * USS Caliente (AO-53), oiler * USS Pecos (AO-65), oiler * USS Cimarron (AO-22), oiler * USS Standard Arrow (ID-1532), oiler * USS Wabash (AOG-4), oiler * USS Arethusa (IX-135), oiler *
USS Inca (IX-229) USS ''Inca'', a 3,381-ton (light displacement) "Liberty" ship, was launched in March 1943 in Los Angeles, California, and entered merchant service later the same month as SS ''William B. Allison'', MCE hull 724. Two years later she would be ta ...
, oiler * USS Neches (AO-47), oiler * USS Lackawanna (AO-40), oiler * USS Gazelle (IX-116), oiler * USS Kaskaskia (AO-27), oiler *USS Antona (IX-133), oiler tanker barge *YO-76, oiler tanker barge *USS Bullwheel (YO-46), oiler tanker barge * USS Gamage (IX-227), storage for lubricants and drummed petroleum * USS Giraffe (IX-118), gasoline tanker *USS Quiros, water tanker * USS Athanasia, stores ship * USS Palisana (AF-39), stores ship * USS Latona (AF-35), stores ship *
USS Graffias (AF-29) USS ''Graffias'' (AF-29), a , is the only ship of the United States Navy to have this name. The name ''Graffias'' is another name for the star Beta Scorpii in the constellation Scorpius. The ''Graffias'' was originally laid down in 1943 as ''T ...
, stores ship * USS Trefoil (IX-149), stores ship * USS Quartz (IX-150), stores ship * USS Megrez (AK-126), stores ship * USS Aldebaran, food stores ship * USS Polaris (AF-11), food stores ship * USS Sirius (AF-60), refrigerator food stores ship * USS Rutilicus (AK-113), food stores ship *SS Cape Pilar, merchant food stores ship * USS Ascella, medical stores ship * USS Azimech, medical stores ship * USS Iolanda, stores ship * USS Carmita (IX-152), stores ship * USS Arctic (AF-7), stores ship * USS Gordonia (AF-43), stores ship * USS Hesperia, stores ship * USS Volans, stores ship * USS Karin (AF-33), stores ship * USS Adria, stores ship * USS Antares (AG-10), stores ship * USS Lioba (AF-36), stores ship * USS Kerstin (AF-34), stores ship * USS Luna, stores ship * USS Corundum (IX-164), spare parts * USS Trefoil (IX-149), stores ship * USS Silica (IX-151) fresh, frozen food, and dry provisions, *APL-14 - propelled barracks ship *APL-15 - propelled
barracks ship A barracks ship or barracks barge or berthing barge, or in civilian use accommodation vessel or accommodation ship, is a ship or a non-self-propelled barge containing a superstructure of a type suitable for use as a temporary barracks for sai ...
* USS Orvetta (IX-157), barracks ship *USS Sea Hag, barracks ship *USS Seaward (IX-209) troopship and mail ship (was USS LST-278) *YF-1038 cover lighter
Type B ship The Type B ship is a United States Maritime Administration (MARAD) designation for World War II barges. Barges are very low cost to build, operate, and move, and can transport bulky cargo. Because barges lack engines for self-propulsion, they are ...
*YG-36, YG-33 and YG-37 self-propelled Garbage lighterYG-36
'navsource.org'' *YF-254 lighter *YC-1006 lighter *YP-688 lighter *YF-788 lighter *YF-786 lighter * USS Turkey (AMS-56)
minesweeper A minesweeper is a small warship designed to remove or detonate naval mines. Using various mechanisms intended to counter the threat posed by naval mines, minesweepers keep waterways clear for safe shipping. History The earliest known usage of ...
*
USS Unadilla (ATA-182) Although originally projected as steel-hulled, seagoing, rescue tug ATR-109, the third ''Unadilla'' was re-classified an auxiliary ocean tug and redesignated ATA-182 on 15 May 1944; laid down on 30 June 1944 at Orange, Texas, by the Levingston ...
Tugboat A tugboat or tug is a marine vessel that manoeuvres other vessels by pushing or pulling them, with direct contact or a tow line. These boats typically tug ships in circumstances where they cannot or should not move under their own power, suc ...
, Type V ship * USS Chickasaw (AT-83), Tug *USS ATR 71, Tug *USS AT 116, Tug *USS YTB-372, Tug * USS Hitchiti (ATF-103), Tug *USS YTB-384, Tug *USS Mobile Point, Tug * USS Arapaho (ATF-68), Tug *USS Point Loma, dredge ship *USS Benson, dredge *
Landing Ship, Tank A Landing Ship, Tank (LST) is a ship first developed during World War II (1939–1945) to support amphibious operations by carrying tanks, vehicles, cargo, and landing troops directly onto a low-slope beach with no dock (maritime), docks or pier ...
s (LST) for moving supplies *Small
landing craft Landing craft are small and medium seagoing watercraft, such as boats and barges, used to convey a landing force (infantry and vehicles) from the sea to the shore during an amphibious assault. The term excludes landing ships, which are larger. ...
for moving supplies and personal *
Motor Launch Launch is a name given to several different types of boat. The wide range of usage of the name extends from utilitarian craft through to pleasure boats built to a very high standard. In naval use, the launch was introduced as a ship's boat ...
boats for moving personal


Gallery

File:Falalop Island- Ulithi Atoll.JPG, Falalop Island in Ulithi Atoll File:Ulithimap-1944i.jpg, Naval Base Ulithi US Navy North Anchorage chart from 1944 showing ship berthing locations File:USS Langley (CVL-27) and others enter Ulithi.jpg, USS Langley (CVL-27) and other ships entering Ulithi 2 December 1944 after strikes in the Philippines. File:USS Hancock (CV-19) and USS Wasp (CV-18) at Ulithi in March 1945.jpg,
USS Hancock (CV-19) USS ''Hancock'' (CV/CVA-19) was one of 24 s built during World War II for the United States Navy. ''Hancock'' was the fourth US Navy ship to bear the namesake of Founding Fathers of the United States, Founding Father John Hancock, president o ...
and USS Wasp (CV-18) at Ulithi in March 1945 File:KaitenmannedtorpedoatUlithi.jpg, At Ulithi a Kaiten manned torpedo that was sunk by a base airstrike. One Kaiten made it to the base and sank the USS Mississinewa on 20 November 1944. File:Ulithi 1945.jpg, Ulithi beach in 1945 File:Mail Call, Ulithi, 1944 (10170265846).jpg, Mail Call at Ulithi in 1944 File:"Tune Toppers" Perform for Troops, Ulithi, 1944 (10170343113).jpg, ''Tune Toppers'' perform for Troops at Ulithi in 1944 File:USS Randolph (CV-15) under repair.jpg, USS Randolph (CV-15) under repair at Ulithi from USS Jason on 13 March 1945 after flight deck hit by kamikaze File:Second world war asia 1943-1945 map de.png, Second world war leapfrogging strategy 1943-1945 map File:USS Wasp (CV-18) at anchor in Ulithi Atoll on 8 December 1944 (80-G-294131).jpg, USS Wasp (CV-18) at anchor in Ulithi Atoll on 8 December 1944 File:Ulithi-atoll.gif, Ulithi atoll File:Mogmog_Island_Ulithi_fleet_recreation_center.jpg, Mogmog Island Ulithi fleet recreation center arrival dock in 1944 File:USS Shannon (DM-25) underway in Ulithi Atoll, circa in March 1945 (80-G-K-3816).jpg, USS ''Shannon'' (DM-25) in Ulithi Atoll in March 1945 File:Ulithi.jpg, Map of Ulithi Atoll File:Iwo jima location mapSagredo.png, Map Japan and the Carolines File:USS Ajax (AR-6) repairing USS Guadalupe (AO-32) at Ulithi, 9 February 1945.jpg,
USS Ajax (AR-6) USS ''Ajax'' (AR-6), in service 1943 to 1986, was the second Vulcan class repair ship, ''Vulcan''-class repair ship and the fourth ship in the United States Navy to bear the name. Laid down in 1941, launched in 1942 and commissioned in 1943, sh ...
repairing USS Guadalupe (AO-32) at Ulithi on 9 February 1945 File:Ulithi Islands.png, Ulithi map 1944 File:UlithiCemetery-SM-40501-98dpi.jpg, Ulithi Cemetery File:UlithiLoranStation.jpg, Ulithi LORAN station on at Falalop built in 1952. File:Aerial image of Fais Island.jpg, Aerial image of Fais Island and Naval Base Ulithi's Fais Airfield File:South Pacific islands 1945.jpg, South Pacific islands in 1945


See also

*
US Naval Advance Bases US Naval Advance Bases were built globally by the United States Navy during World War 2, World War II to support and project U.S. naval operations worldwide. A few were built on Allies of World War II, Allied soil, but most were captured enemy fa ...


External links


youtube.com Ulithi Atoll Anchorage Aerial Views of US Navy 5th Fleet at Anchor

youtube.com 1940s World War II: Ulithi, Anchorageyoutube.com US air operations at newly built airstrip on Ulithi Atoll in World War II HD Stock Footage


References

{{Federated States of Micronesia topics Naval Stations of the United States Navy World War II airfields in the Pacific Ocean Theater Airfields of the United States Navy Military installations closed in the 1940s Closed installations of the United States Navy Islands of Yap