Afghanistan's long and tragic story will tarnish the American psyche for generations to come. Blood, bullets, and books did not stop the Reconquista of the hermit kingdom. After two trillion dollars of American treasure and thousands of American GI lives, it was all in vain. The tears on American flags didn't defeat a humble and illiterate insurgency. Men who could barely read or understand thermodynamics defeated the most powerful military in the world. All the trillions and billions of dollars of military hardware, missiles, and Apache helicopters could not defeat a jihadist warrior with a scimitar and sandals. The Taliban sang phrases from The Quarn as they shot American m-4s into the air as they took Kabul. Even as women wept and children screamed at the Kabul airport, Marines were left helpless and unable to save the tens of thousand...