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As of March Israel has something called "Trophy" which outfits a tank with an invisble forcefield that acts as a missile defense. It's the same concept as the Star Wars defense, only more contained. Of course, the problem is Israel's missile defense has been pretty sketchy, and it's just a race of catchup between the rockets, and the rocket defense systems.

My uneducated guess is the Patriot isn't designed to match whatever Korea has cooked up.