Forty years ago, the U.S. ended its war in Vietnam, but we're still fighting over its legacy - in foreign policy and military strategy, and also in books and movies. But there's one question Americans rarely ask: what does the war mean to the Vietnamese themselves?  Taking Revenge Against Coppola's "Apocalypse Now"; A Vietnamese Doctor's Unforgettable Diary; How Soldiers Cope with Killing; War Criminal?; Paul Beatty on "The Nazi and the Barber"; The Man Who Invented Chemical Weapons.