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Dear II-Young Jung,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located 4 series titled the Central Decimal Files, 1910-1963; and Subject Files Relating to Japan 1954-1959 in the General Records of the Department of State (Record Group 59); the Geographic Correspondence Files, 1942-1958 in the Records of the Joint Chiefs of Staff (Record Group 218); and the Security Classified General Correspondence, 7/1947 - 12/1964 in the Records of the Office of the Secretary of the Army (Record Group 335). Some records are digitized and available in the Catalog but not all. For access to and/or copies, please contact the National Archives at College Park - Textual Reference (RDT2) via email at firstname.lastname@example.org.
You may wish to search these websites About the U.S. Forces-Japan; U.S. Military Bases in Japan; Treaty of Mutual Cooperation &_Security Between the United States & Japan; and The U.S.-Japan Security Alliance for additional information.
We hope this is helpful. Best of luck with your research!