When then Marine Lieutenant Colonel Roosevelt Lafontant first started pushing the idea of a space plane for the U.S. Marine Corps in 2002, skeptics didn't even bother to suppress their laughter. But now, with a Concept of Operations (CONOPS)—a formal military document that lays out how a particular weapon system would be used—and a completed, but not yet released Pentagon road map for the technology, people are beginning to take note of the Small Unit Space Transport and Insertion, or SUSTAIN, the notional concept of a Marine space plane.
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