what is thaad system
THAAD: In flight. (click to view full). The Terminal High Altitude Area Defense (THAAD) system is a long-range, land-based theater defense weapon that acts as the upper tier of a basic 2-tiered defense against ballistic missiles.
The Pentagon confirmed today that the US military will deploy a THAAD ballistic missile defence system to Guam. THAAD, which stands for Terminal High-Altitude Air Defence, is a system that shoots down short and medium range missiles.