. "prisoner of war in Hanoi" . "Prisoners of War during the Vietnam War" . . "prisoner of war during the Vietnam War" . "Prisoner of War in North Vietnam" . . . "POW" . "prisoner of war" . . "US POWs" . "prisoner of war of the Vietnam War" . "prisoners of war" . . . "U.S. prisoners of war during the Vietnam War" . . "United States servicemembers as prisoners of war" . "POWs" . "United States prisoners of war" . "eight years in captivity" . "4th Allied Prisoner of War Wing" . "American high-value prisoners-of-war" . "Vietnam era prisoner of war" . . . . . "captured" . "imprisoned and tortured U.S. military personnel" . "U.S. prisoner of war" . "American POWs" . "U.S. prisoners of war during the Vietnam War" . "American POW" . "Hanoi prison system" .