Anyone working within the defense systems and is involved in developing new technologies will laugh at the notion of Flat earth and these conspiracy theories with the technologies defense holds and continually developing to hold the edge.
What sets them apart from other missile defense systems is that they can see around the curves of Earth. They do that through what is essentially a bank shot: they bounce their signal off the ionosphere, then the target, which reflects the energy back to the ionosphere and ultimately to the radar's receiver.
