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If you’re trying to find more information about his service you may want to request his Official Military Personnel Files from the National Personnel Records Center. Note that due to the COVID-19 pandemic, the NPRC has been closed and only completing emergency requests. As of March 29, 2021, the NPRC increased its on-site staffing to 25 percent of the workforce. They are continuing to increase their on-site staffing and are servicing requests associated with medical treatments, burials, and homeless veterans seeking admittance to a homeless shelter. For that reason you want to refrain from submitting non-emergency requests until they return to pre-COVID staffing levels. You can check archives.gov/veteranshttps://www.archives.gov/veteransfor updates to the NPRC operating hours and status. We apologize for any inconvenience.
In the meantime, I would suggest doing some research on Ancestry and Family Search. NARA has partnered with these groups to help digitize and make available quite a few of the WWII records. Family Search does not require a subscription and can be accessed with a free account. Ancestry does require a subscription, but many public libraries offer free access with your library card. We looked up Ralph Billings on Ancestry and found quite a few listings. While these searches can take some time, you should be able to find quite a few records on him.
We hope this information is helpful.