general milley, in questioning from senator cotton you talked about your military advice about leaving on august 31st versus staying to try to help additional americans leave. was it the unanimous recommendation of the joint chiefs that the august 31st date should be observed and if so, why was that the military advice? >> it was of the joint chiefs plus general mckenzie, admiral vaizly and general donahue. the reason is risk to force, mission and american citizens. on the first of september we were going to go to war again with taliban. there was no doubt. we were already in conflict with isis. at that point in time, if we stayed past the 31st, which militarily is feasible but it would have required additional commitment of more forces, 15,000, 25,000 troop. reseize bagram.