北朝鮮がグアムに向けて撃つのはMusudan か Hwasong-12の中距離ミサイルで
Hwasong-14のようなICBMではなく、THAADとAegis艦船のMDで対抗できる

For Guam, currently a THAAD battery is deployed to the island and Aegis
missile defenses ships also are likely being deployed near the island in
the event North Korea would attempt to strike the island.
North Korea has three ICBMs, the Taepodong-2, Hwasong-13, and Hwasong-14.
Those would not be used for strikes on Guam. Other medium-range or
intermediate range missiles such as the Musudan or Hwasong-12 could be used.
Those missiles can be countered by THAAD and Aegis ships.

この高官によれば、MDのさらなる改良の必要性はセンサー部門にあるという。特に
衛星による検知の(グローバルな)充実が今後の課題である

"But when I look at where we need to invest in future missile defenses, I see
the most important thing that we have to invest in right now would be
increased sensor capabilities because we need to be able to characterize the
threat wherever it is on the globe in order to be able to effectively respond
to it with defenses."
Hyten also favors adding sensors in space "because you can't have access to
enough land points in the world to have a full sensor capability, so we need
to go to space."