After his military career, Rockhold worked as a defense contractor, operating mostly in Africa. He first returned to Vietnam in 1992 to work on a program to help economic refugees. He settled in Vietnam in 1995, the same year the United States and Vietnam normalized relations. He married a Vietnamese woman in 2009. In fact, he liked it so much that he persuaded his mother to move to Vietnam from Santa Maria, Calif., also in 2009. She came for the wedding, and decided to stay,” he said with a laugh. She lived in Vietnam until her death in 2015 at...