My father was in Nam and I've only heard three things about it.
One quite funny, he woke up and found a cute monkey eating some bread he left sitting out. He reached over to pet it and got the hell bitten out of him. He was supposed to report it but had seen other guys go through the rabies shots and decided to risk rabies instead.
Another was him hearing a thud outside his tent. Looked out and found a shell which didn't explode.
The last was simply talking about how you couldn't make friends. They'd go out into the jungle and never return.
My FIL was in Korea and to this day if he's napping you do NOT wake him. He'll come out of sleep swinging. He has only told me one other story and it is so horrific I don't even like to think about it.