we could see the disembarking from the helicopters, we could see our guys moving. it was an intense experience for all of us, because it was real time, visually until we lost the visual connection inside the building. >> as the s.e.a.l.s worked their way to the top of the staircase, a fire fight was under way. finally the people in the situation room heard the prearranged s.e.a.l. team code name for osama bin laden, geronimo. >> we knew that was the call sign. when we heard that, they felt they had identified geronimo, that was the first moment, and then geronimo kia. >> kia, killed in action. after more than a decade of efforts to find him, osama bin laden was believed to be dead. >> when that call went out, you know, that was certainly the team's view that they had