, also simply known as the JMSDF Yokosuka Naval Base, is a group of ports and land facilities of the

Japan Maritime Self-Defense Force , abbreviated , also simply known as the Japanese Navy, is the maritime warfare branch of the Japan Self-Defense Forces, tasked with the naval defense of Japan. The JMSDF was formed following the dissolution of the Imperial Japanese Navy (IJN) ...

(JMSDF), which are scattered in multiple districts of

Yokosuka City is a city in Kanagawa Prefecture, Japan. , the city has a population of 409,478, and a population density of . The total area is . Yokosuka is the 11th most populous city in the Greater Tokyo Area, and the 12th in the Kantō region. The city ...

Kanagawa Prefecture is a prefecture of Japan located in the Kantō region of Honshu. Kanagawa Prefecture is the second-most populous prefecture of Japan at 9,221,129 (1 April 2022) and third-densest at . Its geographic area of makes it fifth-smallest. Kana ...

, and where the

Yokosuka District Force is a city in Kanagawa Prefecture, Japan. , the city has a population of 409,478, and a population density of . The total area is . Yokosuka is the 11th most populous city in the Greater Tokyo Area, and the 12th in the Kantō region. The city ...

, etc. are located. It is not officially called a base, but it is used as a common name. The base sits alongside the

United States Fleet Activities Yokosuka or is a United States Navy base in Yokosuka, Japan. Its mission is to maintain and operate base facilities for the logistic, recreational, administrative support and service of the U.S. Naval Forces Japan, Seventh Fleet and other operating f ...

. It has a facility where people can train with Japan's technology to create water pressure in the

deep sea The deep sea is broadly defined as the ocean depth where light begins to fade, at an approximate depth of 200 metres (656 feet) or the point of transition from continental shelves to continental slopes. Conditions within the deep sea are a combin ...

(water depth 450 meters). Not only allied countries such as the

United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...

Thailand Thailand ( ), historically known as Siam () and officially the Kingdom of Thailand, is a country in Southeast Asia, located at the centre of the Indochinese Peninsula, spanning , with a population of almost 70 million. The country is bo ...

, and

Vietnam Vietnam or Viet Nam ( vi, Việt Nam, ), officially the Socialist Republic of Vietnam,., group="n" is a country in Southeast Asia, at the eastern edge of mainland Southeast Asia, with an area of and population of 96 million, making i ...

, but also the navy of hypothetical enemy countries such as

Russia Russia (, , ), or the Russian Federation, is a List of transcontinental countries, transcontinental country spanning Eastern Europe and North Asia, Northern Asia. It is the List of countries and dependencies by area, largest country in the ...

are visiting.

History

On 26 April 1952, the

Coastal Safety Force , also simply known as the Coastal Security Force, was an organization under the jurisdiction of the National Safety Agency, and existed from 1 August 1952 to 30 June 1954 in Japan. It was a maritime security agency established for the purpose o ...

was established from the

Japan Coast Guard The is the coast guard of Japan. The Japan Coast Guard consists of about 13,700 personnel and is responsible for the protection of the coastline of Japan under the oversight of the Ministry of Land, Infrastructure, Transport and Tourism. Th ...

, and the Coastal Safety Force Yokosuka Regional Supervision Department was established at the site of the former Suirai Naval Academy (currently the 2nd Technical School) in Tauraminatocho. On August 1, with the establishment of the

National Safety Agency , was a Japanese administrative agency that once existed. It was set up from 1 August 1952 to 30 June 1954 and was established for the purpose of integrating the National Police Reserve and the Safety Security Force. The NSA is the predecessor of ...

, the Coastal Security Force alongside Yokosuka District Force were both reorganized. On 16 September 1953, Guards Technical School ws newly published in Taura and October 19, Yokosuka District Force moves from Taura to the current location, Nishihemicho. On 16 January 1956, the Maritime Self-Defense Force Technical School was relocated to

Etajima , also called , ''Nomijima'', ''Nomi Island'', or is an island in Hiroshima Bay located in southwestern Hiroshima Prefecture, Japan. The mess with island name originates from the ancient (and possibly legendary) strait at now town . Geography Th ...

. Since education such as institutions will continue to be conducted in Yokosuka, the Maritime Self-Defense Force Technical School Yokosuka Branch School was to be newly established. On 1 March, Self-Defense Forces Yokosuka Hospital opens in Kurihama District. On 1 April 1958, the Yokosuka Defense Force, Kenzaki Guard Station and Kannonzaki Guard Station were newly added to the Yokosuka Base Guard. Maritime Self-Defense Force Technical School Yokosuka Branch School renamed to Maritime Self-Defense Force 2nd Technical School. On 1 June 1959, it was renamed from Yokosuka Base Guard to Yokosuka Guard. On September 1, Yokosuka Education Corps was newly established in the Takeyama area. On 1 February 1961, new editions includes the Yokosuka Supply Station and Yokosuka Factory. On March 1, the Explosive Ordnance Disposal Unit was newly added to the Yokosuka Defense Force. On 1 March 1965, the Funakoshi Division was newly added to the Yokosuka Guard. On 2 March 1970, addition to the base includes Yokosuka Zoushusho and Yokosuka Sanitary Corps. Abolished Yokosuka Works. On 11 April 1974, more addition to the base includes Yokosuka Music Corps. December 27, 1977, the Maritime Self-Defense Force Diving Medical Experiment Team is newly established in the Kurihama area. In 1980, Yoshikura Pier completed. On 1 July 1985, the Yokosuka torpedo control station was abolished. New edition of Yokosuka torpedo maintenance station. On July 1, 1987, the Yokosuka garrison was abolished. Reorganization of the guard. New edition of Yokosuka Base Service Corps. Kenzaki guard station was abolished. On 31 March 1988, the Self-Defense Forces Yokosuka Hospital was relocated to its current location (Taura District). On 8 December 1998, Yokosuka Supply Station and Yokosuka Repair Station were integrated and reorganized into Yokosuka Repair Supply Station, and the torpedo maintenance station and guided ammunition maintenance station were also integrated to Yokosuka Ammunition Maintenance Supply Station. Establishment of the Maritime Self-Defense Force Ship Supply Office and transferred it to the Maritime Self-Defense Force Supply Headquarters. On 15 April 2010, the Hemi Dock was completed. On 11 March 2011, In response to the Tohoku-Pacific Ocean Earthquake, all operable ships belonging to Yokosuka Base were dispatched off

Sanriku , sometimes known as , lies on the northeastern side of the island of Honshu, corresponding to today's Aomori, Iwate and parts of Miyagi Prefecture and has a long history. The 36 bays of this irregular coastline tend to amplify the destructivenes ...

as a disaster dispatch. On 26 March 2012, Yokosuka Guard Kannonzaki Guard Station was abolished and on September 1, Self-Defense Forces Yokosuka Hospital Education Department moved from Kurihama area to Taura area.

Facilities and operational units

Funakoshi District

* Self Defense Fleet Command **

Fleet Escort Force The is the main force of the Self Defense Fleet of the Japan Maritime Self-Defense Force, and played a central role in the Maritime Self-Defense Force, which mainly consists of escort vessels and various other ships. Together with the Fleet Su ...

** Fleet Submarine Command ** Mine Warfare Force Headquarter **

Fleet Research and Development Command The Fleet Research and Development Command belonged to the surface force for the self-defense fleet of the Japan Maritime Self-Defense Force, Maritime Self-Defense Forces. Its main tasks are experimental technology testing and development. Hist ...

Fleet Intelligence Command The Fleet Intelligence Command belonged to the self-defense fleet of the Maritime Self-Defense Forces. It was previously known as Information Business Group. History It was the only intelligence unit of the Maritime Self-Defense Force, which ...

Oceanography ASW Support Command Oceanography (), also known as oceanology and ocean science, is the scientific study of the oceans. It is an Earth science, which covers a wide range of topics, including ecosystem dynamics; ocean currents, waves, and geophysical fluid dynamic ...

**41st Mine Warfare Force **Yokosuka Base Service Corps **Yokosuka Sanitary Corps *

Communications Command Communication (from la, communicare, meaning "to share" or "to be in relation with") is usually defined as the transmission of information. The term may also refer to the message communicated through such transmissions or the field of inquir ...

**Maintenance audit team

Yoshikura District

*Yokosuka District General Manager **Yokosuka Repair and Supply Station *1st Escort Flotilla Command **1st Escort Squadron *2nd Escort Flotilla **6th Escort Squadron *Communications Command **Yokosuka System Communication Corps *Maritime Self-Defense Force police force **Yokosuka District Police

Nagaura District

*Yokosuka Base Service Corps *Yokosuka Sanitary Corps

Arai District

*Yokosuka District Force **Yokosuka Ammunition Maintenance Supply Station **Yokosuka Guard *Fleet Escort Force **Maritime Training Guidance Group Command *Fleet Submarine Command **Submarine Education and Training Corps

Kusugaura District

*Fleet Submarine Command **2nd Submarine Squadron *Oceanographic Command / Anti-submarine Support Group ** Anti-submarine data corps *Yokosuka District Force ** Yokosuka Repair and Supply Station

Taura District

*Maritime Self-Defense Force 2nd Technical School *Maritime Self-Defense Force Supply Headquarters **Maritime Self-Defense Force Ship Supply Office *Maritime Self-Defense Force Diving Medical Experiment Corps *Yokosuka District Force **Yokosuka Repair and Supply Station Camp takeyama

Takeyama District

* Yokosuka District Force * Yokosuka Education Corps * Yokosuka Music Corps * Yokosuka Sanitary Corps

Self-Defense Forces Yokosuka Hospital

* Self Defense Fleet * Mine Warfare Force

Gallery

File:JMSDF December 2016 02.jpg, Overhead view of Funakoshi District at night File:JMSDF 2nd Service School.jpg, Main entrance of 2nd Service School File:海上自衛隊海上作戦センター.jpg, Maritime Operations Center in Yokosuka File:DDH-183 with DDH-181 (1).jpg,

JS Izumo JS ''Izumo'' (DDH-183) is a helicopter carrier which, as of 2022, is being converted into a light aircraft carrier. Officially classified as a multi-purpose operation destroyer, she is the lead ship in the of the Japan Maritime Self-Defense Fo ...

at Hemi Dock

References

Port PC Structure Achievements Collection Port PC Structure Study Group
* Instruction regarding the organization of the torpedo maintenance station (Maritime Self-Defense Force instruction No. 21 of 1985)

* [https://www.mod.go.jp/rdb/s-kanto/20_Second_level/03_bout/04_management/nagaurasanbashi.pdf Mutual jurisdiction between the Nagaura Port Facility under the jurisdiction of the Ministry of Land, Infrastructure, Transport and Tourism and the Kurihama Oil Storage Station of the Maritime Self-Defense Force] February 28, 2014, South Kanto Defense Bureau
Yokosuka Port Port Plan 2016 (2016) Partial review Yokosuka City p.8

Minutes of the 34th Yokosuka City Port Council
July 24, 2014,

p. 8
Ministry of Defense Maritime Self-Defense Force official twitter

External links

{{DEFAULTSORT:Yokosuka Naval Base Military installations established in 1954 1954 establishments in Japan

Yokosuka is a city in Kanagawa Prefecture, Japan. , the city has a population of 409,478, and a population density of . The total area is . Yokosuka is the 11th most populous city in the Greater Tokyo Area, and the 12th in the Kantō region. The city ...

* Yokosuka Japanese Navy submarine bases