Usage Conditions May Apply Usage Conditions Apply There are restrictions for re-using this media. For more information, visit the Smithsonian's Terms of Use page. IIIF provides researchers rich metadata and image viewing options for comparison of works across cultural heritage collections. More - https://iiif.si.edu View Manifest View in Mirador Viewer Usage Conditions May Apply Usage Conditions Apply There are restrictions for re-using this media. For more information, visit the Smithsonian's Terms of Use page. IIIF provides researchers rich metadata and image viewing options for comparison of works across cultural heritage collections. More - https://iiif.si.edu View Manifest View in Mirador Viewer Usage Conditions May Apply Usage Conditions Apply There are restrictions for re-using this media. For more information, visit the Smithsonian's Terms of Use page. IIIF provides researchers rich metadata and image viewing options for comparison of works across cultural heritage collections. More - https://iiif.si.edu View Manifest View in Mirador Viewer

This is the post-boost propulsion system for the U.S. Air Force's Minuteman III Intercontinental Ballistic Missile (ICBM). Unlike the Minuteman's booster stages, which are powered by solid fuel rocket motors, the post-bost system relies on liquid fuel engines to steer the reentry vehicle carrying the warhead to its target.

The system includes three separate motors: one that produces 315 pounds of thrust for forward motion; a 22-pound thrust motor to control pitch and yaw; and an 18-pound thrust motor for roll control.

The Minuteman III entered service in 1970 with three independently targeted nuclear warheads. The 1993 START treaty reduced the number of warheads from three to one. The current inventory of 450 MInuteman IIIs is due to remain in service until 2030.

 Display Status

This object is not on display at the National Air and Space Museum. It is either on loan or in storage.
Object Details
Country of Origin United States of America Type PROPULSION-Rocket Engines Manufacturer Bell Aerosystems Company
 Dimensions Approximate: 133.35 x 64.77cm (4ft 4 1/2in. x 2ft 1 1/2in.)
 Materials Magnesium, beryllium, paint, teflon, Aluminum, Cadmium Plating, Fiberglas, Stainless Steel, Rubber (Silicone), cork, paper, Adhesive
 Inventory Number A19770994000 Credit Line Gift of Bell Aerospace Company Data Source National Air and Space Museum Restrictions & Rights Usage conditions apply
For more information, visit the Smithsonians Terms of Use.