A U.S. Marine in Helmand province, Afghanistan, February 2011
Finbarr O'Reilly / REUTERS

The prospect of an end to the conflict in Afghanistan has led many U.S. foreign policy experts to ponder the ignoble conclusion of another war, now a half century past. Vietnam reportedly offers a cautionary tale for some Pentagon officials who worry about reliving the ignominious events of 1975, when the North Vietnamese and the National Liberation Front (NLF) marched triumphantly into Saigon and the last Americans, along with some South Vietnamese allies, struggled frantically to escape by helicopter. Former U.S. Ambassador to Afghanistan Ryan Crocker and others who worry about the humanitarian and geopolitical consequences of withdrawing from

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