tonight. barbara, that is a pretty incredible and unbelievable detail. >> jaw-dropping, erin. just flat-out jaw-dropping. a one-hour notice. what if the weather had gone bad? what if they had been shot at on the way in? what if that helicopter had run into mechanical problems? no more gin for delay, no margin for error. this is the ultimate of u.s. military leaving no one behind on the battlefield. >> reporter: bowe bergdahl may have tried to escape his taliban captors on at least two occasions, a u.s. official tells cnn. but until the army can talk to bergdahl directly, they won't know for sure. however, a u.s. official says we do have reason to believe there were times he tried to escape. bergdahl may not yet have fully talked about his five years in taliban captivity, but he is recovering after nearly a week under u.s. military medical care. the pentagon said he is now