Refueling Exercise An F-35 Lightning II approaches a KC-135R during an aerial refueling exercise, Jan. 6, 2020. About 50 F-35s from Hill Air Force Base, Utah, took part in the training. SHARE: Download: Full Size (1.58 MB) Tags: F-35, Air Force Credit: Air Force Tech. Sgt. John Winn VIRIN: 200106-Z-KV728-1011.JPG Photo Gallery