The Defense Department earlier this month launched a trio of analyses intended to refine the requirement for a system designed to protect U.S. territory, forces overseas and, eventually, friends and allies from ballistic and cruise missiles, as well as fast-moving airborne threats. The Joint Requirements Oversight Council on May 1 approved a joint capabilities document for "integrated air and missile defense," a precursor to a final requirements document that could give birth to a formal weapon system program or a...