The program was projected to have cost $40 billion by 2017. ![]() missile defense programs, such as space-based and sea-based intercept programs, or defense targeting the boost phase and reentry flight phases. Previously known as National Missile Defense (NMD), the name was changed in 2002 to differentiate it from other U.S. ![]() Army, and support functions are provided by the U.S. Missile Defense Agency (MDA), while the operational control and execution is provided by the U.S. ![]() In 2019, a missile defense review requested that 20 additional ground-based interceptors be based in Alaska. The system is deployed in military bases in the states of Alaska and California in 2018 comprising 44 interceptors and spanning 15 time zones with sensors on land, at sea, and in orbit. It is a major component of the American missile defense strategy to counter ballistic missiles, including intercontinental ballistic missiles (ICBMs) carrying nuclear, chemical, biological or conventional warheads. ![]() Ground-Based Midcourse Defense ( GMD) is the United States' anti-ballistic missile system for intercepting incoming warheads in space, during the midcourse phase of ballistic trajectory flight. United States anti-ballistic missile defense for intercepting warheads in spaceĪ Ground-Based Interceptor loaded into a silo at Fort Greely, Alaska in July 2004.
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