Dear Ms. Peacock,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located the series titled Official Military Personnel Files, 1905 - 1998 in the Records of the U.S. Marine Corps (Record Group 127). We suggest that you base your citation using “Citing Records in the National Archives of the United States” (General Information Leaflet No. 17).
We hope this is helpful.