What Happened to American POWs Kept Behind After the Korean War

American families are trying to find their loved ones who did not come home after the Korean War, Vietnam War and Cold War. Do you know about Americans in China during these wars? Americans who stayed in China? Americans who were sent to the Soviet Union or other places? Have you seen Americans in North Korea, Vietnam or Laos?
Please help by emailing us your information. We can keep your name and information private if you want. Thank you!