An Air Force F-15E Strike Eagle weapon systems officer watches as a KC-10 Extender aircraft prepares to conduct in-flight refueling during the Northern Edge 2017 exercise over Joint Base Elmendorf-Richardson, Alaska, May 4, 2017.
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An Air Force F-15E Strike Eagle weapon systems officer watches as a KC-10 Extender aircraft prepares to conduct in-flight refueling during the Northern Edge 2017 exercise over Joint Base Elmendorf-Richardson, Alaska, May 4, 2017.