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The Multi-Unit Space Transport And Recovery Device or MUSTARD, usually written as Mustard, was a concept explored by the British Aircraft Corporation (BAC) during the mid-1960s for launching payloads weighing as much as 2,300 kg (5,000 lb) into orbit. Operating as a multi-stage rocket for launch, the individual stages were near-identical modules, each flying back to land as a spaceplane. Mustard was a modular re-usable space…