Manned Maneuvering Unit-1 G Trainer (MMU)
The MMU-1 G Trainer allows trainees to experience what it is like to operate an MMU in the micro gravity of space. (Working in space unattached to the spacecraft) In an MMU, astronauts on a shuttle mission can travel untethered for short distances to perform satellite retrieval and repair, inspections of the orbiter surfaces, and other activities where a tethered EVA would not suffice.
The MMU uses the same five degrees of freedom as the 5DF:
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