The latter, after all, enjoys two distinct advantages over the former: (1) Orbiting sensors and interceptors are cheaper to build and maintain on the order of a 3-to-1 cost advantage and (2) they offer continuous, global defense coverage.
The latter, after all, enjoys two distinct advantages over the former: (1) Orbiting sensors and interceptors are cheaper to build and maintain -- on the order of a 3-to-1 cost advantage -- and (2) they offer continuous, global defense coverage.