. >> susie: still ahead, warren buffett says he made mistakes in the david sokol episode. my interview with the oracle of omaha, coming up. >> tom: the death of osama bin laden after a decade-long manhunt strikes a strategic blow to al qaeda, so says the white house. that's just one way the events of the past 24 hours alter the world's national security landscape. it is also changes how the u.s. government thinks about and budgets for its security. darren gersh reports. >> reporter: even before an elite team of navy seals attacked this fortress-like compound in pakistan, the u.s. defense establishment was preparing to tighten its budget belt. military analyst loren thompson says the wars in iraq and afghanistan now cost $100 billion a year. he says the strike that killed bin laden will eventually accelerate the winding down of those conflicts. >> there is not going to be a peace dividend associated with osama bin laden's death any time soon. but of course, the reason we are in afghanistan, the reason we went to iraq was all linked to 9/11 attacks. so with the chief author