My Dad spent a year in Korea and a year in Vietnam. He never talked about Vietnam, but was very affected by his experience. When Veterans day came around he didn't want to be reminded. He was very loyal to our country and the flag, but I don't think he wanted to be reminded of what he saw when serving there. My Mom has told me a few stories he told her when he would write home. Not pretty, in fact, very ugly. Lots of death and destruction all around. Raw fear. In fact, he told my Mom that there was only a slim chance he would make it home. He did and of course I'm glad for that!
He never stopped serving, he did so much for people around him. We lost him a couple weeks ago. I will always remember the good man he was.