MX Peacekeeper ICBM
The MX or Peacekeeper Intercontinental Ballistic Missile (ICBM) was the last type of ICBM deployed by the U.S. Air Force. Several innovations made the Peacekeeper one of the most lethal nuclear weapons in history.
Great consideration was given to a rail based deployment for the missile in early debates. This generated considerable controversy in communities that would have been affected. This idea was finally shelved. Instead, it was decided to deploy 50 Peacekeepers in modified Minuteman silos across southeastern Wyoming, in an area directly north of Cheyenne. Peacekeepers were operational from 1987 through 2005.
Note: The missile is now referred to as the Peacekeeper. While under development it was first called Missile-X or MX. This name was most commonly used by the media and during debates before its eventual deployment.