predeployment courses. you survived seal training. you become a navy seal, officially. >> mm-hmm. >> what was your first job? >> my first job, i was assigned to a platoon, bravo platoon, seal team 2. we went to the range, and we were shooting navy qualifications. and i was a pretty good shot. and i did so well, my boss said, "well, this new guy's a good shooter. let's send him to sniper school." so, during that first -- they called it a work-up, which is the training cycle a platoon does before it deploys. they sent me to camp atterbury, indiana, for naval special warfare scout sniper school, and i became a sniper. >> and soon, the boy from butte, montana, who one year before had been delivering taco pizzas, was a navy seal sniper. coming up next on "the man who killed usama bin laden"... >> the world trade center tower number one is on fire. the whole outside of the building -- there was just a huge explosion. >> we said the words "usama bin laden" within 30 seconds.