The Defense Department says four major weapon system programs -- including the Air Force's billion-dollar-plus B-2 Radar Modernization Program -- are facing schedule delays of at least six months, a slip that requires the status of the projects to be reported to Congress. Since December, the bomber's program and three Navy programs have run into difficulty meeting assorted milestones, which requires the Pentagon to submit "selected acquisition reports" to lawmakers explaining the current state of affairs for each. The Commerce...