The Pentagon has launched an effort to quickly field a new radar in the southeastern United States to protect the nation from advanced air and missile threats, aiming for an initial capability by 2028. The planned system would provide long-range detection of cruise missiles, hypersonic weapons and other evolving dangers that could approach the homeland from the south, according to the Missile Defense Agency. The requirement reflects growing concern after China’s surprise 2021 test of a Fractional Orbital Bombardment System,...