An excellent article IMHO and some good quotes:http://www.nationalinterest.org/Article.aspx?id=23214

Opens with:
VOLTAIRE REMARKED of Frederick the Great’s Prussia that “where .some states have an army, the Prussian Army has a state!” The same can easily be said of Pakistan. The destruction of the army would mean the destruction of the country. Yet this is something that the Pakistani Taliban and their allies can never achieve. Only the United States is capable of such a feat; if Washington ever takes actions that persuade ordinary Pakistani soldiers that their only honorable course is to fight America, even against the orders of their generals and against dreadful odds, the armed forces would crumble.
Or:
....when it comes to the Pakistani Taliban and their allies. The military as a whole and the ISI are now committed to the struggle against them, and by the end of 2009, the ISI had lost more than seventy of its officers in this fight—some ten times the number of CIA officers killed since 9/11, just as Pakistani military casualties fighting the Pakistani Taliban have greatly exceeded those of the United States in Afghanistan.