Not sure if you have a military base locally but if so just for future reference to everyone - you can take the info to the base office and they will attempt to locate the soldier. I did that with items from my grandfather. We live MacDill AFB.
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Sadly, our long time Castle Air Force Base closed in the 90s.
And I spent a lot of time going through all the pictures and letters, which unfortunately had no envelopes with return addresses on them. After 50 or so years it was just too much to try to find someone with a rather common name of Smith..one of my aunts married a Smith and she said they almost had to carry a marriage license with them when checking into hotels!!!
Should I find more papers in my late DH's still uncleaned out small outbuilding den, I'd take them to a local VFW and see if they could have some luck with them. That is, if there were no numbers or addresses and they weren't common names with litterly millions of people with the same one.