>> no, it's going to get progressively more dangerous for u.s. troops, anderson, as the withdrawal of u.s. troops and other coalition troops, but it's the americans who are in control of base security, they control the perimeter, as troops draw down on the interior, they will come under more and more pressure. isis or other groups, and general mackenzie referenced in his press conference that they knew or were working on the assumption isis might try to use rockets. they might try to use artillery, they might try to use mortars. these are all indirect fire, mostly, that could impact inside the base, just as american troops are withdrawing. they do have countermeasures, very successful automated counter systems to pick up those rockets and knock them out of the air before they can get in, but at some stage, those weapons systems have to be loaded on aircraft and taken out.