U.S. Air Force Maj. Patrick Hanson and Capt. Brendan Keiper, 351st Air Refueling Squadron pilots,perform a preflight checklist before a training mission supporting Exercise Baltic Operations at RAF Mildenhall, England, June 19, 2019. BALTOPS is an exercise involving approximately 11,600 maritime, ground and air force personnel from 18 countries. (U.S. Air Force photo by Airman 1st Class Joseph Barron)

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Photo by: Airman1st Class Joseph Barron |  VIRIN: 190619-F-PZ401-1051.JPG