quickly the taliban would race to and enter kabul? >> reporter: the surprise factor was that the afghan military collapsed, not just the line forces, but the special forces, the best fighters that they had. that they not only surrendered without firing a shot, but just turned over their equipment, surrendered. some were reportedly executed as they were surrendering. but they just gave up completely and ran from the fight. and this is after billions and billions of dollars spent over 20 years to build up that force. they had a force of 300,000 which vastly outnumbered the taliban. but you can't fight a guerrilla force as we learned in vietnam so many decades ago, without having a will to fight. and despite the best -- the american forces, the highly trained american forces could do