Rocket boosters were incorporated into the two side-mounted legs of astromechs, allowing them to achieve flight for a limited period of time. These extendable boosters were adjustable to allow for varying altitudes.
Brooks Propulsion Devices was shut down by the Galactic Empire following the Clone Wars, bringing an end to their line of rocket boosters. Droids such as R2-D0 and R2-D2 retained their booster systems, though the latter ultimately damaged his booster components, rendering him unable to achieve flight.
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