going to judge this based on that tail your of what happens with these civilians -- failure. just like in vietnam when we left behind people that had helped the u.s. government. they're also going to judge us on whether or not afghanistan becomes a base for terrorism again against the united states. and all those are wide open questions. china is trying to influence the taliban now. they are concerned about extremism in the western part of the country. how are we going to keep pack tan from becoming more influenced -- pakistan, spilling out of afghanistan into pakistan a nuclear-powered country. these are, these are major kind of broader strategicking concerns. and then there's the american position in the world. how do you formulate alliances with people, how do you say take a risk, join us in this effort if they feel at the end of the day you might leave abruptly and leave behind those who, in fact, had helped the united states?