THAAD, or Terminal High Altitude Area Defense, is created to intercept short- to intermediate-range ballistic missiles in their final phase of flight.
On July 11, the US test-fired its THAAD anti-ballistic missile system from Kodiak Island, successfully intercepting a target missile launched from an Air Force Cargo plane north of Hawaii, according to Fox News.
"In addition to a successful target intercept data collected will allow the missile defense Agency to improve the defense system THAAD, our modeling capabilities and the ability to stay ahead of the evolving threat", said Lieutenant General of the air force Sam greaves, Director of the Agency of missile defense.
In a statement, the Army said the exercise involved Army Tactical Missile System (ATACMS) and South Korea's Hyunmoo Missile II.
THAAD is a ground-based missile defense system.
South Korea had previously suspended its use of the THAAD system, while its regional neighbor Japan rejected it in favor of a different missile defense system.
One expert that spoke with the U.K's Guardian newspaper said that the flight time of the missile suggested it could easily reach cities in Alaska and may be capable of hitting New York City.
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The medium-range ballistic missile was detected, tracked and intercepted, it said.
"We have a responsibility to our allies and our nation to showcase our unwavering commitment while planning for the worst-case scenario".
THAAD's deployment to North Korea has angered China and Russian Federation, who think the system's powerful radar could be used to gather data on their territories.
Meant as a "stern warning" to Washington, according to North Korean state media, Friday's launch aimed for "maximum distance".
"The U.N. Security Council has clear regulations on North Korea's launch activities that use ballistic missile technologies".
U.S., President Donald Trump had condemned the launch branding it as "reckless and dangerous".
"I am very disappointed in China", he posted on Twitter. The last time the USA tested THAAD, earlier this month, it said it successfully intercepted an intermediate-range missile target.