US THAAD deployed in South Korea is operational 80205172

Defense & Security News - South Korea
 
Initial operational status for US THAAD anti-missile system deployed in South Korea
According to some US officials, the Terminal High Altitude Area Defense (THAAD) system is operational and can protect South Korea against North Koreal missiles. The Terminal High Altitude Area Defense (THAAD) is an advanced defensive anti-missile system that incorporates a long-range radar used to track incoming ballistic missiles in their terminal phase of flight.
     
According to some US officials, the Terminal High Altitude Area Defense (THAAD) system is operational and can protect South Korea against North Koreal missiles. The Terminal High Altitude Area Defense (THAAD) is an advanced defensive anti-missile system that incorporates a long-range radar used to track incoming ballistic missiles in their terminal phase of flight.
     
The system only has "initial intercept capability". It will be strengthened later this year as more parts of the system arrive. The system's deployment to South Korea was agreed to in July of last year, but the initial components of the THAAD system did not arrive in South Korea until the first week in March. The THAAD missile system will add another layer of anti-missile defense for South Korea. The U.S. military and South Korea both have Patriot anti-missile batteries that can defend against short range missiles. The Terminal High Altitude Area Defense (THAAD) is a United States Army anti-ballistic missile system designed to shoot down short, medium, and intermediate range ballistic missiles at ranges of 200 km and at altitudes up to 150 km.

American Company Lockheed Martin is the THAAD prime contractor and systems integrator for four major components: a radar; a fire control and communications unit; launchers and interceptors. Since November 2005 the THAAD program has achieved a 100 percent mission success record in 11 flight test missions, including six successful intercepts of threat representative targets.