The Inertial Upper Stage (IUS), originally designated the Interim Upper Stage, is a two-stage solid-fueled rocket upper stage developed by the U.S. Air Force for raising payloads from low Earth orbit to higher orbits following launch aboard a Titan III(34)D or Titan IV rocket, or from the payload bay of the Space Shuttle.
Read more about Inertial Upper Stage: Development, Applications, Flights, Gallery
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He added, if you really care to know,
He meant to clear the upper pasture, too.”
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