Got to https://www.archives.gov/research/military and see if you can find his name. Sometimes you can't find anything. It depends on when and what his military experience was. Hope this helps.
Try here: https://ancexplorer.army.mil/publicwmv/#/arlington-national/ Also, ANC has an app that can be downloaded here... https://www.arlingtoncemetery.mil/Explore/Find-a-Grave (Links are valid on the date posted but may not remain valid indefinitely.)
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