Ground-Based Midcourse Defense
United States anti-ballistic missile defense for intercepting warheads in space / From Wikipedia, the free encyclopedia
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Ground-Based Midcourse Defense (GMD), previously National Missile Defense (NMD), is an anti-ballistic missile system implemented by the United States of America for defense against ballistic missiles, during the midcourse phase of ballistic trajectory flight. 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.[1]
As of 2018, the system is composed of two interceptor staging bases in the states of Alaska and California, with 40 staged in the former, 4 staged in the latter, for a total of 44 interceptors, as well as the component early warning and targeting sensors based on land, sea, and in orbit.[2][3] As of 2019, a Missile Defense Review has requested 20 additional interceptors to be based in Fort Greely, Alaska, though their delivery has not materialized.[4]
GMD is administered by the U.S. Missile Defense Agency (MDA), while operational control is provided by the U.S. Army, with support functions provided by the U.S. Air Force and U.S. Space Force.