start a new chapter in my life. >> emotions overwhelming, especially there at new york's ground zero. americans celebrated just served and -- justice served and remembered those killed in the september 11 attacks. the operation that took down osama bin laden followed years of intelligence gathering, and apparently months and months of planning. it was carried out, though, in less than 40 minutes. the administration won't give a breakdown of the specific forces used, but a senior defense official says navy s.e.a.l.s. were involved, and brandon webb was a navy s.e.a.l. for ten years, took part in operations in afghanistan and pakistan. he's joining us from san diego. u.s. forces knew the home but perhaps not the layout. how did they train for this, how would they have trained for this specifically attacking and penetrating a compound, they obviously had never been to before. >> yeah, drew, these guys were -- would have just had a lot of connectnology at their diz posal. there's some amazing 3d target