I don't know if you've done this yet but you could try to get his military records from St. Louis. I did with mine. Found out so much from them on WWII and AF career. Some records were lost in a big fire they had in the 70's. I got lucky and my dad's were still there.
Yes, Jim, I tried that a long time ago, and that's the answer I got. I was assisted by a woman whose name and rank I don't remember, but she was the commander of the state VFW. After repeated enquiries and letters, the best we could come up with was that his records were lost in the big fire. I have a few old papers, his Purple Heart, Good Conduct Medal, campaign ribbons, and other citations along with their papers, etc. Also a bunch of wartime photos, and some old pics of his outfit at Camp Lewis and other places with their field pieces, horse teams, etc.