190619-F-XW046-0067
U.S. Air Force Capt. Brendan Keiper and Maj. Patrick Hanson 351st Air Refueling Squadron pilot, review a pre-flight checklist during Exercise Baltic Operations, at RAF Mildenhall, England, June 19, 2019. The BALTOPS Exercise is designed to improve training value for participants enhance flexibility and interoperability, and demonstrate resolve among allied and partner forces in defending the Baltic Sea region. (U.S. Air Force photo by Senior Airman Alexandria Lee)