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After NASA decided to move Saturn IB launches from LC-34 to LC-39, it was modified by the addition of a structure known as the Milkstool, which allowed the Saturn IB to use the same Launch Umbilical Tower as the much larger Saturn V. Three manned flights to Skylab, and the Apollo launch for the Apollo-Soyuz Test Project, were conducted from ML-1 using the Milkstool.