Throughout the Vietnam War, the United States estimated that more than 2,500 American service members were taken prisoner or went missing during the Vietnam War. North Vietnam acknowledged only 687 of those unaccounted for. Most of them were returned during Operation Homecoming in 1973 after the Paris Peace Accords ended U.S. involvement in Vietnam. Of those 687, only 36 U.S. troops managed to escape their captors in North Vietnam and Laos. Of course, there were other attempts, but only those...