Ballistic missile defense has undergone fundamental changes over the past few months. Global politics, technology, budgets and inter-service rivalries are all playing their part in shaping the new landscape. Some-where in this mixture are the needs of the military forces and civilian populations that face an increasing threat, writes Mark Hewish In a series of recent interlinked moves, the US has reshuffled the cards in its ballistic missile defense (BMD) pack. The outcome is still uncertain, with shifts in direction occurring almost daily. In January 2002, the country's Ballistic Missile Defense Organization (BMDO) was redesignated the Missile Defense Agency (MDA)....