According to senior Obama administration officials, some of it may be going to the Taliban, as part of a protection racket in which insurgents and local warlords are paid to allow the trucks unimpeded passage, often sending their own vehicles to accompany the convoys through their areas of control.

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Instead, Wardak sits atop a murky pyramid of Afghan subcontractors who provide the vehicles and safeguard their passage. U.S. military officials say they are satisfied with the results, but they concede that they have little knowledge or control over where the money ends up.