My father died in 2005 at the age of 81. I only ask because he told me a lot of what I thought were stories but wound up being true. And against his wishes think it needs to be a part of history. Personally, at the time I thought it was all bullshit until he died and then president George W. Bush sent him a flag, a medal of honor, and a signed letter that was hand written. I just wondering is there any good I can do from this?
I suggest you ask this question /r/genealogy. There are people there extremely used to research military history in the United States because the only and easiest way I see for you to find out about your father's military history is to find his military records.
As there, they know how to find these documents and what you can can't find. Good luck on your research.