Far as I can tell. 4 different sources link the same photo to his story.
Not going to hand on heart confirm it to you, and someone better with the research might want to take over from here, but that’s what I managed to dig up.
If photo is, in fact, him, then he has an argument. If not, he will just have to suck it up and move on. Many of us who served in VN (and many who serve in Korea) learned to live with it and most gradually worked their way out of it and moved on with our lives.
A whole generation did this after WWII.