By Garth Calitz There are aircraft that refuse to retire gracefully, and then there is the Boeing B-52 Stratofortress. First flown in 1952, the venerable bomber has outlived generations of aircraft, witnessed the rise and fall of military technologies and continues to find new ways of making itself relevant. Now, it looks set to acquire another rather unpleasant party trick: launching missiles travelling at more than five times the speed of sound. Lockheed Martin has been awa