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LGM-118 Peacekeeper
The LGM-118A Peacekeeper, also known as the MX missile (for Missile-eXperimental), was a land-based ICBM deployed by the United States starting in 1986. The Peacekeeper was a MIRV missile that could carry up to 10 re-entry vehicles, each armed with a 300-kiloton W87 warhead in a Mk.21 reentry vehicle (RV). A total of 50 missiles were deployed starting in 1986, after a long and contentious development program that traced its roots into the 1960s.
Under the START II treaty, which never entered into force, the missiles were to be removed from the US nuclear arsenal in 2005, leaving the LGM-30 Minuteman as the only type of land-based ICBM in the arsenal. Despite the demise of the START II treaty, the last of the LGM-118A "Peacekeeper" ICBMs was decommissioned on September 19, 2005. Current plans are to move some of the W87 warheads from the decommissioned Peacekeepers to the Minuteman III.
The private launch firm Orbital Sciences Corporation has developed the Minotaur IV, a four-stage civilian expendable launch system using old Peacekeeper components.
==Development and deployment==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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