francona. dan rather who hash to afghanistan 16 times. all of you know so much about this, the context we all need so much tonight. general heart ling, it is a massive bomb. we heard about it. we know this was targeted at a remote area. that were the point. if it were dropped on a city, to give us a sense of how big this is, what would it do? well, to a city, erin, and that s why it hasn t been used in the wars in iraq and afghanistan is a lot of combat has been in the cities. it was use against the position, a very good combat commander in afghanistan said i can destroy cave complex in a defensive area but most importantly he can also get after the i.e.d.s because the overpressure of this bomb. it doesn t penetrate a cave wall but it provides overpressure to