Thank you for contacting History Hub.
Here is a web page from the United States World War One Centennial Commission regarding Graves Registration Card Registers: https://www.worldwar1centennial.org/index.php/commemorate/family-ties/documenting-doughboys/2223-graves-registration-card-registers-1917-22.html
The page has a lot of information regarding the information on the cards. The page does note: “The card often lists a photograph number in the space marked photograph. It appears that these photographs were not preserved.” The page does not tell anything about the “R. B. No.” but this may be the case as well.
Additionally, here is a link to a blog post about the Burial Cards of World War I soldiers:
Of course, you can request a copy of his Official Military Personnel File (OMPF), if you have not done so already. OMPFs and individual medical reports for enlisted men of the U.S. Army who were separated from the service after October 1912 and before 1959 are in the custody of NARA's National Personnel Records Center (NPRC) 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. Please complete a GSA Standard Form 180 and mail it to NARA's National Personnel Records Center, (Military Personnel Records), 1 Archives Drive, St. Louis, MO 63138-1002. For more information see Official Military Personnel Files (OMPF), Archival Records Requests.
This may be some duplication of the above links, but here is a page on Requesting Veterans’ Service Records from the National Archives:
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. We apologize for this inconvenience and appreciate your understanding and patience.
We hope this is helpful. Best of luck with your research.
Thank you for your comprehensive response!
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not an answer but check out https://www.arcgis.com/apps/webappviewer/index.html?id=aeea8c48cdb04ddc9d5815e82abd3174&extent=-36789.6785%2C5985179.282… to see the location of initial and final grave locations of WWI personnel
Steve, I've seen that. It is a tremendous resource that has been put together. My ancestor's Quartermasters Graves Registration file only had coordinates for his initial battlefield burial, not the plat shown on that resource.