carbuff
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I'm thinking his prints in NamUs hitting on the prints in his military records would depend on both sets of prints being digitized and put in the same db.
IIRC, from what Carbuff has said, a lot of military fingerprints were destroyed in a fire and most are still on cards, not in a db.
The FBI was stepping up their game and trying to catch up with inputting fingerprints. They are using new technology to enhance prints and have had some success with the updates.
Unless he's older than the estimate, he would have served well after the fire, which was in 1973 and affected mostly discharge records from before 1964.
Here's a National Archives article about it: Archives Recalls Fire That Claimed Millions of Military Personnel Files
The FBI's digitization project was finalized a few years ago. I don't remember if that included military records or not.
Here's a fascinating article about fingerprint technology and the algorithms for matching. https://www.ncjrs.gov/pdffiles1/nij/225326.pdf