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The unmanned Falcon Hypersonic Technology Vehicle 2 (HTV-2) is designed to fly through the upper reaches of Earth's atmosphere at speeds of up to Mach 20, providing the US military with a possible platform for striking targets anywhere on the planet with conventional weapons.
The HTV-2 was launched last week aboard a Minotaur IV rocket from Vandenberg Air Force Base in California, according to the Defense Advanced Research Projects Agency (DARPA).
The test flight called for a 30-minute mission in which the vehicle would glide at high speed before splashing down in the Pacific Ocean, north of a US military test site at the Kwajalein Atoll.
The glider separated from the booster but soon after the signal vanished, a spokeswoman said.