I see so may requests that I thought I would post this information. If others have more possibilities, please comment on this post. Good Luck to All in your quest.
********************* Google Standard Form 180 - complete as much information as you can before submitting. If a wife (or husband if vet is a woman) is still living or a sibling, have them sign the papers. If not get the oldest living relative to sign it. Supposedly a fire in 1973 destroyed millions of Army records but from alpha H-Z. So good luck.
If he was member of a VFW, contact them as they should have some records.
If he received VA benefits, contact the regional office where he was living before he passed.
If he had a military burial, contact the funeral home/and or the Sexton of the Cemetery where he is buried. They should have some records.
If you haven't already gone through his belongings, do so as he may have a booklet or folder with his military papers.
If he was in the US Army, see if you can locate his serial number on this site. There may be others with the exact same name so you will have to narrow it down....first by year of birth and then State. But if you can't find him by the State as you first look at it the list...go into the actual records to see "Nativity" as it may be different than where he enlisted or was drafted into the service.
Contact the County Clerk or State Archives where he settled after the war as they were encouraged to register their discharge. Valuable information is on the discharge papers.Having his military serial number would be helpful for them.