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A Northrop Grumman B-2 Spirit stealth bomber approaches an U.S. Air Force KC-10(A) tanker plane over the Missouri sky to receive an aerial refueling after taking off from the Whiteman Air Force Base in Johnson County, Missouri in this October 30, 2002 file photo. The U.S. Government Accountability Office (GAO) on February 16, 2016 rejected a protest filed by Boeing Co and Lockheed Martin Corp against a multibillion-dollar bomber contract awarded to Northrop Grumman Corp by the U.S. Air Force in October. (Photo by Hyungwon Kang/Reuters)
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