Have you tried getting his medical records. There may be alot of information there. I think the hospital in Denver was called Lettermans and I believe it is closed now. I think if you cntacted a Veterans Administrion Office in your area they could help. Or try St. Louis again. You can get a what is called a Standard Form 180 on the computer. Go to Google.com and type in Standard Form 180 and print out both sides. The back side will have the addresses. It is simple to fill out and ask for his medical records. May take awhile. Be sure and check with the Vets Admin.