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In 1966, the U.S. Air Force began studies for a successor to the LGM-30 Minuteman ICBM. In April 1966, the new ICBM program was officially started as Weapons System 120A AICBM (Advanced Intercontinental Ballistic Missile), and in July that year the designation ZBGM-75A was allocated to the missile. The BGM-75 was to be a large solid-rocket powered missile with 10 to 20 nuclear warheads in independent reentry vehicles. It was to be based in super-hardended silos and/or on mobile trains. However, the AICBM program was not approved by the Secretary of Defense and cancelled in 1967. It was not until 1972 that the Air Force began another ICBM program, the then planned to be mobile MX (later LGM-118 Peacekeeper).
The BGM-75 program was cancelled before any design work was done.
 James N. Gibson: "Nuclear Weapons of the United States", Schiffer Publishing Ltd, 1996
 Department of Defense Missile Nomenclature Records
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