Johnny finally came marching home again on a rainy day in late March in the town of Quincy, Mass. The town turned out to pay its respects to Edward Alan Brudno and to 47 other hometown sons who made the ultimate sacrifice in a war no one wanted. Al Brudno was one of the longest-held American prisoners of war during Vietnam: He endured nearly eight years of torture and solitary confinement that began when he was shot down over North Vietnam in October 1965. He was 25 then. He survived to come home with the other POWs who were freed...