What is “Terminal High Altitude Area Defense ( THAAD )”, sometimes seen in the news

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Terminal High Altitude Area Defense (THAAD), formerly Theater High Altitude Area Defense, is an American anti-ballistic missile defense system designed to shoot down short-, medium-, and intermediate-range ballistic missiles in their terminal phase (descent or reentry) by intercepting with a hit-to-kill approach. Used by‎: ‎United States Army Designed‎: ‎1987 No. built‎: ‎numerous Place of origin‎: ‎U.S wikipedia