Flight Formation The Thunderbirds, the Air Force's air demonstration squadron, fly in formation over Royal Air Force Mildenhall and RAF Lakenheath, England, July 10, 2017. The Thunderbirds trailed a KC-135 Stratotanker for air refueling en route to northern Scotland. Air Force photo by Senior Airman Justine Rho SHARE: Download: Full Size (0.87 MB) Credit: Senior Airman Justine Rho VIRIN: 170710-F-ZI687-0111C.JPG Photo Gallery