"Does he have a choice; What is he going to do admit to backing the wrong guy?"
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Easy....he convinces Rumsfeld to resign on his own initiative. And yes, he does have a choice.
Second guessing is easiest thing in the world to do, but the fact is, there is no way of knowing if the alternative would have worked out better. We can only know the results of what we have actually done....and can only speculate what might have happened if a different path were taken.
Its possible the generals are right....but their public ranting is useless and only emboldens the enemy.