>> our only choice was going to be to ram the airliner. sir, i remember you would take the cockpit, to aim at the terrorists... and i would take the tail. >> o'donnell: that's not something you survive. >> no. as the military, we don't send our service members on suicide missions. but... it was clear what needed to be done that morning. >> o'donnell: it was not an order through the chain of command. it was your call to ram the plane. >> we didn't have any other choice. and we weren't going to be caught on the ground, watching america get hit again. >> o'donnell: what they didn't know was that the passengers and crew of flight 93 fought back, and drove the plane into a field in shanksville. 20 years later, how often do you think about that day, 9/11? >> i think about it every day. those on flight 93 that paid the