Dear Mr. Betz,
Thank you for posting your request on History Hub!
Information on the semi-annual rosters (i.e., April and October) for 1960-74 for Army units are attached to the morning reports of the respective units. All rosters for the period are not available and usually list only enlisted personnel. Paper copies may be obtained from microfilm by writing to NARA's National Personnel Records Center, (Military Personnel Records), 1 Archives Drive, St. Louis, MO 63138-1002. Research and reproduction fees are charged for this service. Please complete a GSA Standard Form 180 to request this information.
Due to the coronavirus public health emergency, the National Personnel Records Center is servicing only urgent requests related to homeless veterans, medical emergencies, and funerals which may be faxed to 314-801-0764. We thank you for your patience and look forward to resuming normal operations when the public health emergency has ended.
We also searched the National Archives Catalog and located the series Cavalry Unit Records, ca. 1965 - ca. 1973 in the Records of the United States Forces in Southeast Asia (Record Group 472) that includes records of the 1st Squadron, 9th Cavalry for 1965-1970 in Boxes 260-272. For access to these records, please contact the National Archives at College Park - Textual Reference (RDT2) via email at firstname.lastname@example.org.
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.
We hope this is helpful. Best of luck with your family research!