Dear Mr. Rodriguez,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located the series First Release of Name Files Under the Nazi War Crimes and Japanese Imperial Government Disclosure Acts, the series First Release of Subject Files Under the Nazi War Crimes and Japanese Imperial Government Disclosure Acts, the series Second Release of Name Files [...], and the series Second Release of Subject Files [...] in the Records of the Central Intelligence Agency (Record Group 263). The records from the two Second Release series have been digitized and may be viewed online using the Catalog. Please contact the National Archives at College Park - Textual Reference (RDT2) at firstname.lastname@example.org for further assistance with these records. More information about the Interagency Working Group (IWG), which includes the Japanese Imperial Government Disclosure Act, may be located on the National Archives website.
Next, we located 200 series related to the Ryukyu Islands in the 1950s created by the U.S. Civil Administration of the Ryukyu Islands (USCAR) in the Records of U.S. Occupation Headquarters, World War II (Record Group 260) that may contain some relevant information. In addition, we located the series Intelligence Reports of the 500th Military Intelligence Group, 1947-1958, the series Intelligence Reports, 1947-1951, and the series Intelligence Report Files, 1955-1956 in the Records of General Headquarters, Far East Command, Supreme Commander Allied Powers, and United Nations Command (Record Group 554) that may be of interest to you. The series General Records Related to Intelligence Activities, 1954-1963 in the Records of the U.S. Army, Pacific (Record Group 550) and the series Intelligence Document File Publications, 1946-1962 in the Records of the Army Staff (Record Group 319) include intelligence information related to the Far East as well. These records have not been digitized. For access to and information about these and similar records, please contact RDT2.
Due to the COVID-19 pandemic and pursuant to guidance received from the Office of Management and Budget (OMB), NARA has adjusted its normal operations to balance the need of completing its mission-critical work while also adhering to the recommended social distancing for the safety of NARA staff. As a result of this re-prioritization of activities, you may experience a delay in receiving an initial acknowledgement as well as a substantive response to your reference request from RDT2. We apologize for this inconvenience and appreciate your understanding and patience.
Finally, the documents you seek may be available via the Freedom of Information Act Electronic Reading Room - Special Collections Archive on the CIA website.
We hope this is helpful. Best of luck with your research!