Your Dad is a hero. As are all of those here who served and their families.My Dad spent a little over two years there, always near the the front line. Some times he would watch the few programs about the war that wasn't a war and sometimes he didn't want to relive it I suppose. I think it reminded him of all the young men who never came home. That was something that always bothered him.
My Dad was a Marine; a tank operator. He served his time, was discharged, started college, and then it started. He kept expecting to get called back up, but wasn’t. He lost some friends. He has always felt a sense of guilt. But he shouldn’t, given what he subsequently contributed to the satellite space program.