Dear Ms. Keeler,
Thank you for posting your request on History Hub!
We suggest that you begin by requesting a copy of his Official Military Personnel File (OMPF). OMPFs and individual medical reports for enlisted men of the U.S. Army who were separated from the service after October 1912 and prior to 1957 are in the custody of NARA's National Personnel Records Center in St. Louis. In many cases where personnel records were destroyed in the 1973 fire, proof of service can be provided from other records such as morning reports, payrolls, and military orders, and a certificate of military service will be issued. Enclosed is a GSA Standard Form 180 which you should complete and mail to NARA's National Personnel Records Center, (Military Personnel Records), 1 Archives Drive, St. Louis, MO 63138-1002. Or you may apply online at https://www.archives.gov/veterans/military-service-records/
To obtain a headstone for your grandfather, you need to apply for one. Please contact the National Cemetery Administration, Department of Veterans Affairs, 810 Vermont Avenue, NW., Washington, DC 20420 or fill out an electronic application online at www.cem.va.gov. For more information, send an email to firstname.lastname@example.org.
We hope this information is helpful.