China's surprise demonstration last year of a Fractional Orbital Bombardment System prompted the U.S. military this summer to conduct an air defense exercise against a hypothetical threat approaching the U.S. from the south, a significant reorientation from the usual focus on the north, west and east. On June 29, North American Aerospace and Defense Command’s continental U.S. region conducted a defensive counter-air exercise involving Navy and Air Force assets that hunted a simulated cruise missile attack as part of Noble...