M55E1

The M55E1 is used in the following systems:

• Minuteman III
• Minotaur

Earlier versions of the Minuteman used the M55A1 for the first stage.^[1] The US Army Homing Overlay Experiment also used the M551E1 as the first stage.^[2]

• Manufacturer: Thiokol
• First Launch: March 14, 1970
• Liftoff Thrust: 935,000 kN (210,196 lbf)
• Total Weight: 30,000 kg (66,000 lb)
• Diameter: 1.68 m (5.51 ft)
• Length: 16.0 m (52.00 ft)^[3]