James Joseph Dresnok (Joe Dresnok) was one of 4 american soldiers that defected to the North Kora during war there. If you are interested in this kind of stories this piece of documentary below is going to fulfill your needs.
Joe Dresnok (born 1941) lives in North Korea to this day. I belive there is another documentary about his story called "Crossing the line".
1st part of 60 Minutes documentary film:
2rd part of 60 Minutes documentary film: