insure that the safety of not only around the gates but the other checkpoints so that we can continue to process vulnerable afghans, other coalition folks and american citizens in. >> when this evacuation began there were already close to 1,000 u.s. troops at that airport. so just to be clear, when we're talking about pulling u.s. troops out, we're talking about pulling all the troops, so you go to zero at the embassy, is that correct? >> i followed the question. that's correct. >> you have to take out more than you put in. >> yes. >> so how does that happen without the active cooperation of the taliban to keep the