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 IMAGE: Download Image: Small (163.84 KB)| Medium (194.56 KB)| Full Size (1.58 MB) Tags: F-35, Air Force Photo By: Air Force Tech. Sgt. John Winn VIRIN: 200106-Z-KV728-1011.JPG Photo Gallery