crowds away as u.s. troops first thin out their perimeter and then pull back? how does that happen? >> i will let the general take that. he is much more informed than i am. the larger issue that any retrograde out of or drawdown out of an environment that you can't assume is always going to be permissive is one that has to be done very carefully and sequenced in a methodical way so the safety and security of our people and the people we're trying to protect is considered of paramount importance. and so we aren't -- i'll level set with you now we won't be able to tell you once we start to affect this withdrawal and