[TMWNN]

> Can you actually "win" a nuclear war? I thought we all understood that as foolish.

There is nothing, except cost, preventing the US from building enough Aegis/Aegis Ashore/THAAD launchers to defend the entire US. The recent Iranian strike was a useful small-scale live test of the technology, but both Aegis and THAAD have been tested and worked on for long enough for the US to have reasonable confidence in them.

This is not including things like laser weapon descendants of YAL-1, or Starship deploying Brilliant Pebbles en masse into orbit, or thousands of Starshield satellites watching every inch of the planet (and/or carrying Brilliant Pebbles). They would be helpful, and possibly superior, but Aegis and THAAD are enough, in theory.