A Pentagon advisory board is calling for a more "defensible and resilient" National Leadership Command Capability to shore up weaknesses in the command and control systems used by the president and critical to ensuring continuity of government during a national crisis. A Defense Science Board study is recommending a three-pronged strategy to improve the complex "system of systems" following "deep concerns" about vulnerabilities to cyber threats and electronic warfare attack from both state and non-state actors, among other concerns raised...