America has begun preparing for a major attack on the nation's capital - by simulating incoming missiles and hijacked airplanes.US defense contractor Northrop Grumman announced the successful test of its Integrated Battle Command System (IBCS) this month.The Beltway-area around Washington , known by defense personnel as the 'National Capital Region,' was successfully defended against 'simulated cruise missiles and 'compromised aircraft,' the company said.
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