Defense Secretary Donald Rumsfeld is tackling a problem that has befuddled every one of his predecessors: trying to get the Defense Department running as a leaner and more efficient organization, the new service secretaries and the deputy defense secretary said today. Rumsfeld's maneuvers may lead to more joint programs and cooperation among the services, they suggested. Rumsfeld's approach differs from his predecessors' in that he is giving wide authority to the service secretaries to find efficiencies and is paring back...