Yet in practice, the tests have shown very mixed results, with the most recent U.S. missile defense test by the Navy failing to shoot down a missile launched by the same ship that had the interceptors on board. Is the growing threat from North Korea enough to sway congress to continue the deployment in South Korea?
The US statement said the B-1Bs released "inert" weapons at the Pilsung Range.
When asked on Friday about a possible Australian missile defence system against such threats as a North Korean intercontinental ballistic missile, Mr Turnbull said the Australian focus was on protecting deployed forces in the field. "North Korea's continued pursuit of nuclear& ballistic missile programmes and proliferation links pose grave threat to global peace".
It is believed Kim's new missile could obliterate a major U.S. city, with an estimated range of around 4,160 miles.
"Each THAAD system is comprised of five major components: interceptors, launchers, a radar, a fire control unit and support equipment, according to Lockheed Martin, the security and aerospace company that serves as the prime contractor for the equipment".
Vice Admiral James Syring, a former director of the Missile Defense Agency, said in May the THAAD system has a 100% success rate in its 13 flight tests so far.
The THAAD interceptors will be fired from Alaska, Reuters reported.
Earlier this month Moscow and Beijing, in a joint statement, called on Washington to immediately halt deployment of Thaad in South Korea.
THAAD interceptors are positioned in Guam which are meant to help guard against a missile attacks, such as one from North Korea.
That led the Pentagon to upgrade its assessment of America's ability to defend against a small number of ICBMs.