Fuchu Air Base (府中基地, Fuchū Kichi) is a Japan Air Self-Defense Force (JASDF) base located in Fuchū, Tokyo. It was originally an Imperial Japanese Army base from 1940 to 1945. After the Japanese surrender it was occupied by US forces and became a US military base known as Fuchu Air Station.
The Japan Self-Defense Forces started operating at the base in 1957, and it was also the first headquarters of the United States Forces Japan from 1957 to 1974, when the headquarters moved to Yokota Air Base.
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The United States Forces Japan (USFJ) (Japanese: 在日米軍, Hepburn: Zainichi Beigun) is a subordinate unified command of the United States Indo-Pacific Command. It was activated at Fuchū Air Station in Tokyo, Japan, on 1 July 1957 to replace the Far East Command. USFJ is headquartered at Yokota Air Base in Tokyo and is commanded by the Commander, U.S. Forces Japan who is also commander of the Fifth Air Force. Since then, it is the first and only sustained presence of a foreign military on Japanese soil in its history.
USFJ oversees U.S. military personnel, assets, and installations in Japan, including approximately 55,000 active-duty servicemembers and 15 major bases. USFJ supports U.S. responsibilities under the Treaty of Mutual Cooperation and Security between the United States and Japan, and its activities are governed by the Status of Forces Agreement (SOFA) between the United States and Japan. The command plays a major role in security-related coordination and dialogue with the Government of Japan and the Japan Self-Defense Forces.