Vietnam POWs came home heroes, but twenty years earlier their predecessors returned from Korea to shame and suspicion. In the Korean War American prisoners were used in propaganda twice, first during the conflict, then at home. While in Chinese custody in North Korea, they were pressured to praise their treatment and criticize the war. When they came back, the Department of the Army and cooperative pundits said too many were weaklings who did not resist communist indoctrination or "brainwashing." Ex-prisoners were featured in a publicity campaign scolding the nation to raise tougher sons for...