I hope someone has since told Richard Armitage that the THAAD missile defense system is for the defense of South Korea and not the US mainland because the system is not designed to shoot down ICBMs:
The main purpose of U.S. efforts to deploy a THAAD missile defense unit to South Korea is to protect the U.S. mainland from North Korean missile threats, a former top American diplomat said Wednesday.
Former Deputy Secretary of State Richard Armitage made the remark during a security seminar on Korea, claiming that hosting a Terminal High Altitude Area Defense battery is a responsibility South Korea has as an ally of the United States.
“I think the United States has approached this incorrectly … I think we have not been as clear … about what THAAD does as we should have been,” Armitage said during the seminar hosted by the Center for Strategic and International Studies and the Korea Foundation.
“I see the deployment of THAAD as an alliance responsibility for the Republic of Korea because THAAD, although it covers some of the Republic of Korea, … it is more for the defense of the United States, the continental United States against North Korean missiles,” he said. [Korea Herald]
You can read more at the link, but the system the US has to shoot down North Korean ICBMs is the Ground-based Midcourse Defense System (GMD) which has interceptors in Alaska and California.