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At any moment, we have to understand they could close Kabul's airport. All they would need to do is put a couple of mortars in the middle of it. C-17s would turn around and have to leave. That's their protocol, so, the Taliban are calling the shots. And there's nothing we can do. If they say we have to be out by the 31st, that's what we're going to have to do, unless we were to re-invade Afghanistan, which I don't see coming.