The father's friend, discovered

So this lady in church, profession in sales, told of meeting this other salesman. Here's his story:
The salesman's father had served two tours in Vietnam. Between then and now the son had traveled to Europe with a group of young men. They then split up to go their various ways, and this son decided to go to Vietnam to see where his father had been for a couple days. He liked the land, they were friendly, so he decided to stay. He learned the language and worked for the Consulate. When Clinton signed the treaty to get released the Vietnamese soldiers who had been with the South - then imprisoned by the North, he interviewed them to see where they wanted to go. This one guy said he had a friend in America and wanted to go live with him. He didn't know where he was. The friend had given him his journal.
The son looked at it. It was all tattered and such. Then he saw the name on it. It was his father who was the American friend to that Vietnamese prisoner.
The son notified his father, who flew over to Vietnam and brought his friend back with him.