It has been called the most daring raid of the Vietnam War; Operation Ivory Coast was an effort to rescue prisoners of war who had been held by North Vietnam for years. It did not rescue any of the prisoners, but it did change the way U.S. Special Operations planned and executed its missions.  By 1970, the United States not only knew that hundreds of American POWs were being held by the communist North Vietnamese, but they also knew those prisoners were being subjected to torture and...