Specifications Primary function: Intercontinental ballistic missile Contractor: Basing: Boeing Aerospace and Electronics; assembly and test: Martin Marietta and Denver Aerospace Power Plant: First three stages, solid-propellant; fourth stage, storable liquid (by Thiokol, Aerojet, Hercules and Rocketdyne) Length: 71 feet (21.8 meters) Weight: 195,000 pounds (87,750 kilograms) including re-entry vehicles Diameter: 7 feet, 8 inches (2.3 meters) Range: Greater than 6,000 miles (5,217 nautical miles) Speed: Approximately 15,000 miles per hour at burnout (Mach 20 at sea level) Guidance system: Inertial; integration by Rockwell, IMU by Northrop and Rockwell Warheads: 10 Avco MK 21 re-entry vehicles