Northrop Grumman has submitted its bid to develop the nation's next intercontinental ballistic missile system, a key nuclear deterrent program the Air Force is hoping to keep on a tight schedule amid concerns about the legacy ICBMs' deteriorating condition and upheaval in the competition for the prime contract. Nathan Drevna, a Northrop spokesman, told Inside Defense in an email today that the company has sent its offer to develop the system that’s expected to replace the current Minuteman III...