We begin the hour with Tom Clavin, former writer for the New York Times, and co-author of "Last Men Out: The True Story of America's Heroic Final Hours in Viet Nam." The book is an extraordinarily powerful and detailed look at America's withdrawal from Saigon and the courage shown by the last Americans left there. We end the hour with historian and author Niall Ferguson ("Empire") whose lengthy interview with Henry Kissinger is the heart of a National Geographic documentary airing tonight titled "Kissinger."