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Hypersonic vehicles propelled by air-breathing propulsion systems, in addition to the scramjet missile currently under consideration, might include higher Mach number, long-range missiles; theater-reach and global-reach aircraft designed to deliver weapons or for reconnaissance missions; and space launch vehicles.
The HSTDV is an unmanned scramjet demonstration aircraft for hypersonic speed flight. It is being developed as a carrier vehicle for hypersonic and long-range cruise missiles, and will have multiple civilian applications including the launching of small satellites at low cost.