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LG-118A Peacekeeper

The Peacekeeper missile is America's newest intercontinental ballistic missile (ICBM). Its deployment fulfilled a key goal of the strategic modernization program and increased strength and credibility to the ground-based leg of the U.S. strategic triad. Since the end of the Cold War, the United States has been revising its strategic policy and has agreed to eliminate the multiple re-entry vehicle Peacekeeper ICBMs when Russia ratifies the Strategic Arms Reduction Treaty II.

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History

The Air Force successfully conducted the first test flight of the Peacekeeper June 17, 1983, from Vandenberg Air Force Base, CA. The missile traveled 4,190 miles (6,704 kilometers) before dropping six unarmed test reentry vehicles to planned target sites in the Kwajalein Missile Test Range in the Pacific Ocean.

The first two test phases consisted of 12 test flights to ensure the Peacekeeper's subsystems performed as planned, and to make final assessments of its range and payload capability. The missile was fired from aboveground canisters in its first eight tests. Thereafter, test flights were conducted from test launch facilities reconfigured to simulate operational Peacekeeper sites.

The Air Force achieved initial operational capability of 10 deployed Peacekeepers at F.E. Warren AFB, WY, in December 1986. Full operational capability was achieved in December 1988 with the establishment of a squadron of 50 missiles.

The former Ballistic Missile Office began full-scale development of the Peacekeeper in 1979. This organization, formerly located at San Bernardino, CA, integrated the activities of more than 27 civilian contractors and numerous subcontractors to develop and build the Peacekeeper system.

Description

The Peacekeeper is capable of delivering 10 independently targeted warheads with great accuracy. It is a four-stage rocket ICBM system consisting of two major sections: the boost system and the post-boost vehicle system that includes the re-entry system.

The boost system consists of four rocket stages that launch the missile into space. These rocket stages are mounted atop one another and fire successively. Each of the first three stages exhausts its solid propellant materials through a single movable nozzle that guides the missile along its flight path.

Following the burnout and separation of the boost system's third rocket stage, the fourth stage post-boost vehicle system, in space, maneuvers to deploy the re-entry vehicles in sequence.

The post-boost vehicle system is the Peacekeeper Stage IV that has a guidance and control system and re-entry system. The post-boost vehicle rides atop the boost system. Stage IV weighs about 2,500 pounds (1,333 kilograms) and is 3.5 feet (1.07 meters) long.

The top section of the Peacekeeper post-boost vehicle is the re-entry system. It consists of the deployment module, up to 10 cone-shaped re-entry vehicles and a protective shroud. The shroud protects the re-entry vehicles during ascent. It is topped with a nose cap, containing a rocket motor to separate it from the deployment module.

The deployment module provides structural support for the re-entry vehicles and carries the electronics needed to activate and deploy them. The vehicles are covered with material to protect them during re-entry through the atmosphere to their targets and are mechanically attached to the deployment module. The attachments are unlatched by gas pressure from an explosive cartridge broken by small, exploding bolts, which free the re-entry vehicles, allowing them to separate from the deployment module with little disturbance. Each deployed re-entry vehicle follows a ballistic path to its target.