Valiant Liberty An Air Force F-15E Strike Eagle prepares to receive fuel from a KC-135 Stratotanker off the coast of England, March 5, 2020, during Valiant Liberty, an agile combat employment exercise. SHARE: Download: Full Size (1.13 MB) Tags: Air Force, Valiant Liberty Credit: Air Force Tech. Sgt. Emerson Nuñez VIRIN: 200305-F-TF218-1025C.JPG Photo Gallery