how do you get as many of those people out as fast as you can while you're also beginning to evacuate the military, which creates further risk in the coming days. that's a very difficult task and dealing with a complex security environment. i think part of what you've seen in recent days too is less clearing of people at the check points and more trying to find ways to bring people into the airport in convoys so there's less exposure of people having to be cleared in a chaotic scene at the gates of the airport. >> you're right. even overnight given all that's happened, 13,400 according to official figures coming out of the white house. they're talking about 104,000 people. less than a thousand americans at least according to the state department still remain in the country. talk about the logistical challenge now of isis now knowing what's vulnerable, now feeling motivated that they have been able to attack and kill americans and kill afghans, and for whatever they think their end game is.