now we re learning the reason why they chose that specific target. it might not necessarily be what you think. i m wolf blitzer. you re in the situation room. captions by vitac www.vitac.com he s certainly one of the most visible people on the planet that with global media watching his every single move. how did president obama take most of the world by surprise when he showed up in afghanistan. we re learning new details of this rather complex and massive operation. our white house correspondent brianna keilar is joining us. brianna, tell our viewers what you are learning. reporter: there was nothing normal about how this trip was executed and even from the way president obama entered air force one early, early in the morning on tuesday at andrews air force base. instead of taking the normal multi-story set of stairs he takes usually, he went on a smallerest is stairs into almost the belly of the plane, near the front of the plane and in addition, this is a trip th