FTG-15 was accomplished by an operational team of the 100th Missile Defense Brigade using their standard operating procedures (round-the-clock 24/7). Although they knew in advance that there would be a test launch, they did not know exactly when it would occur or its exact nature. Non-intercept tests Canceled tests Throughout the program's history, multiple test flights have been canceled, including BV-4, IFT-11, -12, -13, -13A, -15, FTC-03, and, most recently, FTG-04. Estimated effectiveness The system has a "single shot probability of kill" of its interceptors calculated at 56%, with the total probability of intercepting a single target, if four interceptors are launched, at 97%. Each interceptor costs approximately $75 million. See also Terminal High Altitude Area Defense (THAAD), mobile land-based missile defense system Medium Extended Air Defense System, mobile land-based air and missile defense system Aegis Ballistic Missile Defense System, sea-based missile defense system A-135 anti-ballistic missile system A-235 anti-ballistic missile system S-300VM missile system S-400 missile system S-500 missile system SC-19 Arrow (Israeli missile) Arrow 3 Proposed Eastern United States missile defense site References External links Ground-based Midcourse Defense (GMD) System page on Boeing site GMD page on Missile Defense Agency site Missile Threat - GMD on CSIS.org Boeing Ground-Based Interceptor on Designation Systems site Ballistic Missile Defense System page on Global Security site Missile Defense Agency Anti-ballistic missiles of the United States Boeing Raytheon Company products Lockheed Martin