The Defense Department will take another three years to refine the price tag for the Air Force's new intercontinental ballistic missile project, drawing on feedback from Northrop Grumman and Boeing, the two contractors selected last month to develop competing ICBM designs. The department was bedeviled last year in its attempt to establish a reliable cost estimate for the Ground Based Strategic Deterrent program. Lt. Gen. Jack Weinstein, deputy chief of staff for strategic deterrence and nuclear integration, said the near-term...