>> so colonel, you have the tactical piece of this, but i'm stuck on the 1.2 million people that nick just mentioned who live in mosul, potentially trapped and could be used as human groups. aides groups would like them to have safe package. if isis said sure we'll let them out, how do you get these people out safely? >> you could, for instance, declare ceasefire, open up a humanitarian corridor, and allow unarmed people out. of course they would have to be checked thoroughly because when that occurred during the battle of fallujah in 2004 a lot of the al-qaeda and iraq fighters escaped with the civilians, so this is something that is possible, could be done, but it would have to be carefully managed to make sure that the isis fighters don't slip through our grasps, when these civilians leave the battlefield. >> remind us why is not you'mos