The Pentagon is settling on a concept for a Next-Generation Interceptor, a nearly 10-year project that will require a radical overhaul of planned missile defense spending while raising questions about the efficacy of the Ground-based Midcourse Defense system to protect the nation in the interim. The Missile Defense Agency -- at the behest of Under Secretary of Defense for Research and Engineering Mike Griffin -- is finalizing over the next two weeks a solicitation for a clean-sheet design for a...