a deadline, counterinsurgency expert david kilcullen, encouraged the taliban to fight on. >> i immediately went out and spoke to the population and said the americans are leaving in 18 months. >> reporter: the goal is to create an afghan government complete with army and police force that can fend for itself against the taliban. but before that can happen, u.s. troops will have to drive the taliban out of khandahar for the second time. the u.s. is not likely to get a third chance in afghanistan, this time is make or break. katie. >> couric: david, we have a question for you tonight from a viewer. to what extent do the leaked documents offer taliban insurgents material for propaganda aimed at u.s. troops and our allies? >> well, the documents contain reports of incidents in which u.s. forces caused civilian casualties. and the taliban never misses a chance to blame that on americans. so this will undoubtedly be more grist for their propaganda mill. >> couric: david, thanks very much. meanwhile the pentagon today released the names of the two navy petty officers who got caught up in a fire f