The head of U.S. Strategic Command wants to streamline the wide array of ballistic missile defense sensors and command and control tools in order to improve operational control of such defenses. Gen. James Cartwright, commander of the Omaha-based command, is challenging those who work for him to identify ways to assemble a more coherent approach to integrating various elements of the missile defense systems that are being developed and fielded. Cartwright, as head of Strategic Command, is responsible for operational...