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A superfast unmanned military plane traveled at 20 times the speed of sound and managed to control itself for three minutes before crashing into the Pacific Ocean in a recent test, military officials said. The prototype Falcon Hypersonic Technology Vehicle 2 (HTV-2), billed as the fastest aircraft ever built, splashed down in the Pacific earlier than planned on Aug. 11 shortly after launching from California's Vandenberg Air Force Base on its second-ever test flight. The HTV-2 experienced some sort of anomaly, prompting the vehicle's autonomous flight safety system to guide it to a controlled splashdown, according to the Defense Advanced Research Projects Agency