India on Monday successfully flight tested the indigenously-developed hypersonic technology demonstrator vehicle (HSTDV) that is expected to power futuristic long-range missile systems and aerial platforms, officials said. The HSTDV, based on hypersonic propulsion technologies, has been developed by the Defence Research and Development Organisation (DRDO), they said. Defence Minister Rajnath Singh congratulated the DRDO over the successful test flight of the HSTDV, calling it a "landmark achievement"