Photograph by Horst Faas/ Associated PressVietnam was the first “ living room war, ” seen on TV and through remarkable photography. Photojournalists captured war’s most personal moments, the best and worst of human nature. They felt the bombs.... They documented the suffering. Their work reshaped politics and amplified opposition to the war. The Vietnam War ended 50 years ago this week. What do its images still have to teach?...