Try the VA, thay may have records before the fire.
Thay may have medical records from before the fire that will list what units he was in. It's worth a shot.
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OR, a veterens organization he could have a member of....
Or, he may have filled all this info in the local courthouse..
And, post on the Panama board,
Anyway, good luck, the info is somewhere, just have to find it,
We will all keep looking,