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U.S. Air Force Airman 1st Class Kelsie Walls, a 13th Aircraft Maintenance Unit crew chief, communicates over a headset with a pilot prior to take-off during exercise RED FLAG-Alaska 19-1, at Eielson Air Force Base, Alaska, Oct. 9, 2018. Maintainers repaired jets alongside joint and multilateral partners from around the world, affording them opportunities to exchange tactics, operations techniques and procedures, which improve international interoperability.