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The second and final flight test of DARPA’s Hypersonic Test Vehicle 2 (HTV-2) is expected to take place today over the Pacific Ocean. The wedge shaped unmanned hypersonic test vehicle is scheduled for launch by a Minotaur IV rocket from Vandenberg Air Force Base on the pacific coast, between 7 AM and 1 PM PDT. The flight is expected to take about 20 minutes.