legacy, you talk about how every american president has to deal with the spector of vietnam, gag myer, the idea of how many how we get stuck. vietnam one war america has lost. here you come now to president obama, a new generation, after vietnam, and you say he is still bedeviled by vietnam, why? >> absolutely. and that is because the power of a lost war has infiltrated itself into the white house. they use different language now. you talk about an exit strategy but you mean vietnam as the lesson. every single president was haunted by this lost war. they were affected by it. they were influenced by it. but they came to different conclusions. for example, ronald reagan, extraordinary politician, ronald reagan on his shift in october of 1983, 241 american marines were murdered by islamic fanatics in beirut, lebanon.