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Lockheed confirms it's building the unmanned hypersonic SR-72 aircraft
div.generic {width:85%;background:#ECECEC;border:1px solid #f55b42;padding:15px;} WHY THIS MATTERS IN BRIEF The next generation of aircraft, and warfare, will be hypersonic and as China and Russia make big advances in the space the US is stepping up its game The US has been playing around wi