David A. Andelman, a contributor to CNN and columnist for USA Today, is the author of “A Shattered Peace: Versailles 1919 and the Price We Pay Today.” He formerly served as a foreign correspondent for The New York Times and Paris correspondent for CBS News. Follow him on Twitter @DavidAndelman. The views expressed in this commentary are his.
(CNN)Sorry, Mr. President, but the US can’t get out of Afghanistan. Not now, maybe never. The only real question is how deep do we stay and for how long?

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