countries without sustaining a permanent military presence or fighting in a war. and that is what we intend to do with respect to afghanistan, as well. this isn't a question whether we're clear eyed about the terrorist challenge from afghanistan. it's about whether the terrorist challenge in 2021 is fundamentally different from the terrorist challenge in 2001. we believe it is fundamentally different and we need to be post t -- postured to deal with the terrorism challenges we find today as opposed to 20 years ago. >> can you shed light on the decision to leave behind blackhawks and other equipment, how that fits in with the contingency plan -- >> leave behind? >> blackhawks and other equi equipment. why give the taliban access to state of the art equipment to use to bolster their defense or sell to other countries? >> this is a good example of the difficult choices a president faces and a secretary of defense and national security advisor face in the context of the end