A U-2 Dragon lady pilot pre-breaths pure Oxygen before takeoff during exercise Northern Edge 17 at Joint Base Elmendorf-Richardson, Alaska, May 9, 2017. Northern Edge is a biennial joint training exercise involving approximately 6,000 personnel and 200 fixed-wing aircraft, and dates back to 1975. (U.S. Air Force photo/Staff Sgt. Jeffrey Schultze)

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Photo by: Staff Sgt. Jeffrey M. Schultze |  VIRIN: 170510-F-GU448-003.JPG