A U.S. Air Force KC-135R Stratotanker assigned to the 909th Air Refueling Squadron from Kadena Air Base, Japan, prepares to refuel an F-15C Eagle assigned to the 57th Wing from Nellis Air Force Base, Nev., during exercise Northern Edge, May 16, 2019, over Alaska. Northern Edge is one in a series of U.S. Indo-Pacific Command exercises in 2019 that prepares joint forces to respond to crises in the Indo-Pacific region. (U.S. Air Force photo by Staff Sgt. Micaiah Anthony)