Terminal High Altitude Area Defense (THAAD), formerly Theater High Altitude Area Defense, is an American anti-ballistic missile defense system, deployed since 2008, designed to intercept and destroy short-, medium-, and intermediate-range ballistic missiles in their terminal phase (descent or reentry)."Development of a Hit-to-Kill Guidance Algorithm for Kinetic Energy Weapons". Defense Technical Information Center. 1988. . The THAAD interceptor carries no warhead, instead relying on its kinetic energy of impact to destroy the incoming missile. THAAD was developed after the experience of Iraq's Scud missile attacks during the Gulf War in 1991."THAAD". Naver Dictionary.

THAAD has an operational range of 200 km. Each battery consists of six transporter erector launcher trucks with eight launch tubes each, 48 interceptors, one AN/TPY-2 transportable radar, three control stations, and a crew of 90 soldiers. The control stations connect to the US C2BMC communications system, integrating THAAD into a layered air defense architecture alongside the longer-range Ground-Based Interceptor, the similar-range Aegis Ballistic Missile Defense System, and shorter-range MIM-104 Patriot.

A United States Army program, THAAD is also under the umbrella of the Missile Defense Agency. THAAD was originally scheduled for deployment in 2012, but initial deployment took place in May 2008.

As of 2025, the US Army's Air Defense Artillery Branch operated eight THAAD batteries. Until 2026, five batteries were based in the US, one in Guam, one in South Korea, while the destination of the eighth battery was unclear. The US Army has deployed THAAD to Israel, Jordan, Romania, and South Korea. Additionally, the United Arab Emirates Air Force operates two batteries and the Royal Saudi Air Force operates one battery with plans to procure a further six. The deployment of a US THAAD in South Korea, announced in 2016 and begun in 2017, allegedly in response to North Korean nuclear and missile capabilities, played a major role in South Korean politics and heightened tensions with China and North Korea, who each feared it would erode their nuclear deterrence.

THAAD made its first operational interception during the Abu Dhabi attack in January 2022, with an Emirati battery intercepting a ballistic missile fired by the Houthis in Yemen. The U.S. Army deployed a THAAD battery to Israel in October 2024, in the aftermath of the 2024 Iran–Israel conflict. Interceptors were intermittently fired against Houthi missile attacks. In the June 2025 Twelve-Day War, reportedly over 150 interceptors were fired, comprising 25% of total number of missiles funded by all prior US military budgets.

The Center for Strategic and International Studies estimated that U.S. forces expended around half of pre-war THAAD inventories during Operation Epic Fury. Iranian strikes reportedly damaged or destroyed a THAAD installation in Jordan and potentially two in the UAE. Verified by checking satellite images.

Development

The THAAD missile defense concept was proposed in 1987, with a formal request for proposals submitted to industry in 1991. The THAAD program benefited from results of previous missile defense efforts including High Endoatmospheric Defense Interceptor (HEDI) and the Kinetic Kill Vehicle Integrated Technology Experiment (KITE). In September 1992, the US Army selected Lockheed, now Lockheed Martin, as the prime contractor for THAAD development.

Prior to the 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. In April 1995, the first THAAD flight test occurred, 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 in June and August 1999, against Hera missiles.

The US Army Research Laboratory (ARL) assessed the vulnerability of THAAD, which featured an evaluation of the effects of major electromagnetic elements, including EM interference, EM radiation operations, EM radiation hazards, EM pulse, electrostatic discharge, and lightning, on components of the system. The assessment was also designed to determine the system's growth potential given its tactical design and provide survivability analysis against threats such as conventional weapons, chemical weapons, and electronic warfare countermeasures. The data collected from the analyses were used to develop trajectory models for targets and missile as well as target trajectories using infrared scene generation of infrared countermeasures (IRCMs).

The THAAD system is designed, built, and integrated by prime contractor Lockheed Martin Missiles and Fire Control, with key subcontractors including Raytheon, Boeing, Aerojet Rocketdyne, Honeywell, BAE Systems, Oshkosh Defense, and MiltonCAT.

+ Demonstration and validation Date Result Notes 1995-04-21 First test flight to prove the propulsion system. There was no target in the test. 1995-07-31 Kill vehicle control test. The test flight was aborted. There was no target in the test. 1995-10-13 Launched to test its target-seeking system. There was no attempt to hit the target in the test. 1995-12-13 Failed to hit a test target due to software errors in the missile's fuel system. 1996-03-22 Failed to hit a test target due to mechanical problems with the kill vehicle's booster separation. 1996-07-15 Failed to hit a test target due to a malfunction in the targeting system. 1997-03-06 Failed to hit a test target due to a contamination in the electrical system. 1998-05-12 Failed to hit a test target due to an electrical short circuit in the booster system. At this point, the US Congress reduced funding for the project due to repeated failures. 1999-03-29 Failed to hit a test target due to multiple failures, including guidance system. 1999-06-10 Hit a test target in a simplified test scenario. 1999-08-02 Hit a test target in the thermosphere at an altitude of

Engineering and manufacturing In June 2000, Lockheed won the Engineering and Manufacturing Development (EMD) contract to turn the design into a mobile tactical army fire unit. In 2006, flight tests of this system resumed with missile characterization and full system tests at White Sands Missile Range, then moved to the Pacific Missile Range Facility. The Interceptor was led through development and initial production by Tory Bruno, who later became the CEO of United Launch Alliance.

Date Result Notes 2005-11-22 Launched a missile in its first Flight EMD Test, known as FLT-01. The test was deemed a success by Lockheed and the Pentagon."Successful THAAD Interceptor Launch Achieved" , 22 November 2005. 2006-05-11 FLT-02, the first developmental flight test to test the entire system, including interceptor, launcher, radar, and fire control system.Successful THAAD Integrated System Flight Test , 11 May 2006. 2006-07-12 FLT-03. Intercepted a live target missile.Successful THAAD Intercept Flight , 12 July 2006. 2006-09-13 Hera target missile launched, but had to be terminated in mid-flight before the launch of the FLT-04 missile. This has officially been characterized as a "no test". 2006 Fall FLT-05, a missile-only test, was postponed until mid-spring 2007. 2007-01-27 FLT-06. Intercepted a "high endo-atmospheric" (just inside Earth's atmosphere) unitary (non-separating) target representing a "SCUD"-type ballistic missile launched from a mobile platform off Kauai in the Pacific Ocean.Successful THAAD "High Endo-Atmospheric" Intercept Test , 27 January 2007. 2007-04-06 FLT-07 test. Intercepted a "mid endo-atmospheric" unitary target missile off Kauai in the Pacific Ocean. It successfully tested THAAD's interoperability with other elements of the MDS system."MDA's new THAAD success" , Martin Sieff, UPI, 6 April 2007."Army, Navy and Air Force shoot down test missile" , Tom Finnegan, Honolulu Star-Bulletin, 6 April 2007. 2007-10-27 Conducted a successful exo-atmospheric test at the Pacific Missile Range Facility (PMRF) off Kauai, Hawaii. The flight test demonstrated the system's ability to detect, track and intercept an incoming unitary target above the Earth's atmosphere. The missile was hot-condition tested to prove its ability to operate in extreme environments. 2008-06-27 Downed a missile launched from a C-17 Globemaster III."THAAD shoots down missile from C-17". The Associated Press, 27 June 2008. 2008-09-17 Target missile failed shortly after launch, so neither interceptor was launched. Officially a "no test".Defense Test Conducted MDA, 27 September 2008. 2009-03-17 A repeat of the September flight test. This time it was a success. 2009-12-11 FLT-11: The Hera target missile failed to ignite after air deployment, and the interceptor was not launched. Officially a "no test". 2010-06-29 FLT-14: Conducted a successful endo-atmospheric intercept of unitary target at lowest altitude to date. Afterward, exercised Simulation-Over-Live-Driver (SOLD) system to inject multiple simulated targets into the THAAD radar to test system's ability to engage a mass raid of enemy ballistic missiles. 2011-10-05 FLT-12: Conducted a successful endo-atmospheric intercept of two targets with two interceptors. 2012-10-24 FTI-01 (Flight Test Integrated 01): test of the integration of THAAD with PAC-3 and Aegis against a raid of 5 missiles of different types. During this engagement THAAD successfully intercepted an Extended Long Range Air Launch Target (E-LRALT) missile dropped from a C-17 north of Wake Island. This marked the first time THAAD had intercepted a Medium Range Ballistic Missile (MRBM). Two AN/TPY-2 were used in the $180M test, with the forward-based radar feeding data into Aegis and Patriot systems as well as THAAD. 2017-07-11 FTT-18 (Flight Test THAAD 18): The FTT-18 test plan was announced to the public on 8 July 2017.US to test THAAD missile defense system: Report. The first test of THAAD against an IRBM, FTT-18 successfully occurred on 11 July 2017; an Alaska-based THAAD interceptor, launched from the Pacific Spaceport Complex – Alaska on Kodiak island, intercepted its target over Alaska airspace. The FTT-18 target simulated an intermediate-range ballistic missile. It was "launched" near Hawaii from the cargo hold of a C-17, being initially dropped by parachute. From there the mock IRBM proceeded in a north-easterly direction until reaching Alaskan airspace, where it was intercepted."US successfully tests THAAD amid North Korean missile tensions". Foxnews.com, 11 July 2017.FTT-18 THAAD Flight Test Video (11 July 2017) 2:25-minute clip. 2017-07-30 FET-01 (Flight Experiment THAAD 01): In FET-01, the Missile Defense Agency (MDA) gathered threat data from a THAAD interceptor in flight. THAAD detected, tracked, and intercepted a medium-range ballistic missile (MRBM), which was launched from a C-17 by parachute.(30 July 2017) US military hits target missile in THAAD interceptor test Interception at minute 1:04 of 1:20 video clip duration Soldiers from the 11th ADA Brigade conducted launcher, fire control, and radar operations without foreknowledge of the launch time. The MDA director, Lieutenant General Sam Greaves stated: "In addition to successfully intercepting the target, the data collected will allow MDA to enhance the THAAD weapon system, our modeling and simulation capabilities, and our ability to stay ahead of the evolving threat.".

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