Demonstrators with Code Pink protest out Chicago Obama Headquarters in Chicago, Illinois, May 17, 2012, as peace activists march through the street demanding an end to NATO violence ahead of the NATO 2012 Summit. After a decade in Afghanistan, NATO leaders gather for a key summit May 20, 2012, hoping for a show of unity in the final two years of combat -- even though allies are eager to bring troops home. [Xinhua photo]