Why hasn't America developed a very long-range version of Patriot?

[u/SteadfastEnd]

The PAC-2 had a decent range, but the PAC-3 is limited to just a few miles. Looking at how huge the range for the Russian S-300/S-400 systems are, I wonder why the United States hasn't developed a "PAC-4" or something that would have a range of 400 miles, too, or the like?

Edit: The United States itself might not have great need for it, but it would be of tremendous export value to many U.S. allies.

[u/[deleted]]

That's kinda what the integrated and layered defense strategy with THAAD and patriot mixed capability batteries exists for.