The Air Force's intercontinental ballistic missile modernization program will not be able to reuse existing silos as it had been planning since the beginning of the effort 10 years ago, potentially threatening the cost of a program that's already known to be massively over budget. The Air Force decided to scrap the silo reuse plan for the LGM-35A Sentinel after a conversion project of one of the existing test-launch facilities, a service spokesperson said. Data from the project at Vandenberg...