ROUGH CUT - NO REPORTER NARRATION<br/> <br />STORY: Differences between U.S. President Barack Obama and Israeli Prime Minister Benjamin Netanyahu over setting a "red line" for Iran's nuclear project were never a joking matter.<br/> <br />Until now, when both leaders uncorked some rapid fire one-liners during Obama's tour of a partially U.S.-funded anti-missile system that he inspected after a red carpet welcome ceremony on Wednesday at Tel Aviv airport.<br/> <br />"Where do you want to start?" Obama asked an Israeli military official, in a comment picked up by TV cameras providing close coverage of the president and Netanyahu walking together toward the battery.<br/> <br />"We are following the red line, sir," the officer replied matter-of-factly, referring to a red line painted on the tarmac that led to the missiles.<br/> <br />"The red line, okay," said Obama, who smiled, gestured with his thumb toward Netanyahu and said: "He's always talking to me about red lines."<br/> <br />It was a rare moment of levity betwe
