Dear Mr. Corrao,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located Command Chronologies and Related Documentation, 4/1962 - 6/1987 in the Records of the U.S. Marine Corps (Record Group 127) that include 297 items pertaining to the 5th Marine Regiment in the 1970s. Most of the items have been digitized and are available using the Catalog. We also located the Muster Rolls and Personnel Diaries, 1/1941 - 12/1980 in Record Group 127 that includes the 5th Marine Regiment for the 1970s. These are not digitized. For information about the non-digitized 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 research!