Ready Refuel An Air Force F-15E Strike Eagle prepares to receive from a KC-135 Stratotanker during Emerald Flag over the Gulf of Mexico, Dec. 3, 2020. The exercise combined ground, space, cyber, and air platforms for joint test and experimentation. SHARE: Download: Full Size (0.53 MB) Tags: Air Force, Emerald Flag Credit: Air Force Staff Sgt. Joshua Hoskins VIRIN: 201203-F-HA049-0023C.JPG Photo Gallery