Easy way to tell the real vets from the phony ones.
The real ones rarely talk about their experience. If they do, it’s with their buds. Only.
I've found that to be true.
My dad was an Army Major with the Special Forces in Vietnam when I was a kid. On furloughs home to Okinawa, he would always be sort of spooky, and Mom made us kids walk on raw eggs around him.
That was in the mid-sixties. To this very day, he's never offered a word to anyone in the family about what he did in Nam, although he freely reminisces about our family's many moves, and his other deployments.
Nam is like a redacted page of his personal history, and none of us would even think of pressuring him to talk about it. Even after all these years.