USA Anti-Missile Missiles

Terminal High Altitude Area Defense (THAAD), formerly Theater High Altitude Area Defense, is a United States Army anti-ballistic missile system which is designed to shoot down short, medium, and intermediate range ballistic missiles in their terminal phase using a hit-to-kill approach. THAAD was developed to counter Iraq's Scud missile attacks during the Gulf War in 1991. The missile carries no warhead, but relies on the kinetic energy of impact to destroy the incoming missile. A kinetic energy hit minimizes the risk of exploding conventional warhead ballistic missiles, and nuclear tipped ballistic missiles will not detonate upon a kinetic energy hit.

Originally a US Army program, THAAD has come under the umbrella of the Missile Defense Agency. The Navy has a similar program, the sea-based Aegis Ballistic Missile Defense System, which now has a land component as well ("Aegis ashore"). THAAD was originally scheduled for deployment in 2012, but initial deployment took place in May 2008. THAAD has been deployed in the United Arab Emirates, Turkey, and South Korea.

The THAAD system is being designed, built, and integrated by Lockheed Martin Space Systems acting as prime contractor. Key subcontractors include Raytheon, Boeing, Aerojet, Rocketdyne, Honeywell, BAE Systems, Oshkosh Defense, MiltonCAT and the Oliver Capital Consortium

Development

The THAAD missile defense concept was proposed in 1987, with a formal request for proposals submitted to industry in 1991. In September 1992, the US Army selected Martin Marietta (now Lockheed Martin) as prime contractor for THAAD development. Prior to development of a physical prototype, the Aero-Optical Effect (AOE) software code was developed to validate the intended operational profile of Lockheed's proposed design. The first THAAD flight test occurred in April 1995, with all flight tests in the Demonstration-Validation (DEM-VAL) program phase occurring at White Sands Missile Range. The first six intercept attempts missed the target (Flights 4–9). The first successful intercepts were conducted on 10 June 1999, and 2 August 1999, against Hera missiles.

Korea and Japan

In July 2016, American and South Korean military officials agreed to deploy the THAAD missile defense system in the country to counter North Korea's growing threats and use of ballistic missile and nuclear tests; each THAAD unit consists of six truck-mounted launchers, 48 interceptors, a fire control and communications unit, and an AN/TPY-2 radar. Seongju County in North Gyeongsang Province was chosen as the site to base the THAAD, partly because it is out of range of North Korean rocket artillery along the DMZ, which sparked protests from Seongju County residents from fear of the radiation emitted by the AN/TPY-2 radar. On 30 September 2016, the U.S. and South Korea announced that THAAD would be relocated within the county, farther from the town's main residential areas and higher in elevation, to alleviate concerns. By October 2016, Japan was considering procuring either THAAD or Aegis Ashore to add a new missile defense layer.

On 6 March 2017, two THAAD launcher trucks arrived by air transport at Osan Air Base South Korea for a deployment.  Earlier that day, North Korea had launched 4 missiles. A Reuters article stated that with the THAAD defense system, a North Korean missile barrage would still pose a threat to South Korea, while an article in the International Journal of Space Politics & Policy said that South Korean forces already possess Patriot systems for point defense and Aegis destroyers capable of stopping ballistic missiles that may come from the north.

https://en.wikipedia.org/wiki/Terminal_High_Altitude_Area_Defense