(Yonhap Feature) Beneath endless skies, S. Korea's homegrown KF-21 fighter takes wing to guard nation and beyond | Yonhap News Agency

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By Kim Seung-yeonSACHEON, South Korea, May 14 (Yonhap) -- Far down the sprawling runway of the Air Force's 52nd Test Flight Group, a sleek gray aircraft emerged through the heat haze, gathering speed with an ear-splitting roar before soaring into the cloudless sky in a matter of seconds.The thundero