going to battle, controlling your fear, i you don't quit. >> reporter: for months after hell week the training continues until these sailors become navy s.e.a.l.s. >> that sequence of developing confidence is part of s.e.a.l. training. >> reporter: ryan was a s.e.a.l. team commander. >> that's why at the end, they are tough guys. when they go toe-to-toe against somebody there's an absolute belief they will win. failure isn't an option and guys will not give up, ever, ever. >> reporter: that's why when the target is osama bin laden, the president turns to the navy s.e.a.l.s and a special unit, s.e.a.l. team 6. wadsson and zinki were both members. >> s.e.a.l. team 6 is a different unit than the rest of the s.e.a.l. teams and as much as they concentrate primarily on one thing, counterterrorism, hostage rescue.