Admiral Fallon at CENTCOM long seems to have been lukewarm-at-best about the surge so, naturally, just like Petraeus' predecessors in Iraq he's going to be relieved of command. This is what's known in the Bush administration as shaping policy by military conditions on the ground rather than arbitrary dictates in Washington. First, you formulate a policy. Then you find some career military people who agree with it. Then you put them in charge. Then you hide behind them to avoid taking political heat for your own policies. And if they aren't good at serving as frontmen for your policies, or aren't willing to do it, you get some new ones.