As the Air Force continues development of the Ground-Based Strategic Deterrent and Long-Range Standoff Weapon, a new report from the Center for Strategic and Budgetary Assessments questions whether the next-generation nuclear missiles will be able to stand up to rapidly evolving threats of the 21st century. "Increasingly capable [surface-to-air missile] systems, [electronic warfare] systems including directed-energy weapons, GPS-denial capabilities, and other defenses will decrease the probability that U.S. legacy guided weapons -- conventional and nuclear -- will be able to...