Dien Bien Phu. Saigon. Hanoi. In 1954, they were just exotic titles from a French campaign halfway around the world. But now American fighting men-proven for the bloody seashores of Normandy and in the minefields of Korea-are summoned to help beat back again the guerilla causes of Ho Chi Minh. To some, the “top secret” battle in Indochina was the depth of folly. To others, just like the majors, it directed to the heights of glory…