US troops in Pakistan?

In my ongoing search to understand the maze that is the Middle East's real needs-- as opposed to US security interests-- unwrapping the story about an unwrapping country, Pakistan, appears central. I don't have many pieces (yet) but this morning came across an interview that provides insight:

Is there a military solution in Afghanistan and Pakistan? Twenty percent or more of the Pakistan army, including a large section of its officer corps, comes from the North-West Frontier Province, and the people against whom these actions are to be taken are their kith and kin. They are very reluctant to find a military solution to the problem in the Northwestern Frontier Province. They understand that this is part of the Pashtun nationalism, which exists on both sides of the border. Pakistan army understands that if they were to allow the American special forces to come in in a very big way, it would have very detrimental effect on their relationship with China, because that means US special forces come within about 200 miles of the Chinese border.