A U.S. Air Force F-16 Fighting Falcon from the 457th Fighter Squadron, Fort Worth, Texas, prepares to receive fuel from a 100th Air Refueling Wing KC-135 Stratotanker from RAF Mildenhall, England, during exercise Astral Knight over the skies of Italy, June 3, 2019. AK19 is a joint, multinational exercise designed to test Integrated Air and Missile Defense capabilities and will involve a combination of flight operations and computer-assisted exercise scenarios. Participants include the U.S. Air Forces in Europe, U.S. Army Europe forces, and members from the Italian and Croatian air forces. (U.S. Air Force photo by Airman 1st Class Brandon Esau)