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[i]In the early 1970s, NASA planned to develop what it called a "space tug" for lifting shuttle payloads into higher altitude orbits or boosting spacecraft to other planets. In January 1974, NASA awarded a $1.3 million contract to Rocketdyne to design, build and test liquid-hydrogen and oxygen pumps and gas generators that would eventually be used in the tug. NASA debated the actual design of the tug and whether it would be a modification of an existing upper stage or an entirely new rocket. Four proposals were evaluated including the Air Force's Inertial Upper Stage (IUS), a rededesigned wide-body Centaur, Transtage, and the Interim Orbital Transfer Vehicle (IOTV).[/i]
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