The Manned Maneuvering Unit (MMU) is an astronaut propulsion unit that was used by NASA on three Space Shuttle missions in 1984.
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The MMU was used in practice to retrieve a pair of faulty communications satellites, Westar VI and Palapa B2.
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The propulsion unit was used to retrieve two communication satellites, Westar VI and Palapa B2, that did not reach their proper orbits because of faulty propulsion modules.
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