The U.S. military is rapidly expanding its aerial and Central Asian* supply routes to the war in Afghanistan, fearing that Pakistan could cut off the main means of providing American and NATO forces with fuel, food and equipment.
Although Pakistan has not explicitly threatened to sever the supply lines, Pentagon officials said they are concerned the routes could be endangered by the deterioration of U.S.-Pakistan relations, partly fed by ill will from the cross-border raid that killed Osama bin Laden.
How long we been saying this around here? It don't matter how many "boots on the ground" you have, if you can't resupply 'em you might as well let 'em fight with slingshots. The best strategy and tactics are useless without fuel, food, and bullets. If the Pak Taliban don't attack the convoys (which seems to be a monthly occurrence), the convoys have to bribe their way across the border to their destination. It was one of the major reasons the Soviets (and many others before them) threw up their hands and left.