U.S. Air Force Capt. Andrew Kohlbecker, 108th Wing pilot, pre-checks the KC-135R Stratotanker before a mission at Oerland Air Base, Norway, May 22, 2019. The KC-135s are supporting Arctic Challenge Exercise 19, a Nordic aviation exercise intended to provide scenario-based training to prepare partner forces for enemy defensive systems. (U.S. Air National Guard photo by Staff Sgt. Kenneth Shaner Brown)