Dear Mr. Boyer,
Thank you for posting your request on History Hub!
The information you seek may be located in a number of different record groups and series. For example, we searched the National Archives Catalog and located the series Southeast Asia Military Fact Books, 4/1966-9/1970, the series System Files, 1965-1973, and the series Annual Command Histories, 1964-1973 in the Records of the U.S. Forces in Southeast Asia (Record Group 472) that may contain some information related to your research. We also located the series Records Regarding Pacific Area Naval and Fleet Operations, 1/1966-2/19/1970 in the Records of the Office of the Chief of Naval Operations (Record Group 38) that might be of interest to you. In addition, the series Classified and Unclassified Subject Decimal Files, 1960-1973 and the series Top Secret Subject Decimal Files, 1960-1984 in the Records of the Office of the Secretary of Defense (Record Group 330) contain information about North VIetnam, too. These records have not been digitized. Please contact the National Archives at College Park - Textual Reference (RDT2) at email@example.com for access to and information about these and similar records.
We also suggest that you use the National Archives Catalog to search for additional potentially relevant records. The Advanced Search features allow you to search within a specific record group, time period, and so forth. You may wish to explore the Records of the U.S. Joint Chiefs of Staff (Record Group 218) or the Records of the Central Intelligence Agency (Record Group 263) and other intelligence organizations, for example. You may contact the National Archives reference unit listed in each Catalog description for assistance with those records. Please note that some of these records may still be restricted and unavailable for research. It is also possible that some records, like intelligence documents, may not have been transferred to the National Archives yet.
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 or other NARA reference unit. We apologize for this inconvenience and appreciate your understanding and patience.
We hope this information is helpful. Best of luck with your research!
[Some information provided by Martin Gedra and Nate Patch, Subject Matter Expert.]