It's great that the US military has developed this defensive capability.

But, it also signals the US revamped position vis a vis NK.

The  US government is now telling us that it's not about disarming, or de-nuclearizing NK.  It's about defending against their inevitable development of nukes capable of striking the US.

"Don't worry, we can shoot them down".

This is otherwise classified stuff.  Such open, detailed release of information actually signals that US military, and probably National Security leadership is conceding a nuclear, and increasingly sophisticated nuclear NK.  So we when we do go to the table to talk about NK containment paradigms (as opposed to de-nuclearization) we sleep better.

Trump defined his "win" as to NK too clearly.  "De-nuclearization" under threat of "fire and fury".

NK said, "We keep the nukes, go ahead, bring your fire and fury".

The US HAS TO BLINK on that response.  Loss of life in South Korea and Japan, as well as the risk that the US loses. . .