Approaching Lightning An Air Force F-35 Lightning II prepares to couple with a KC-135 Stratotanker for refueling near Estonia, April 25, 2017. The F-35s are participating in their first flying training deployment to Europe. Air Force photo Senior Airman Christine Groening SHARE: Download: Full Size (1.82 MB) Credit: Senior Airman Christine Groening VIRIN: 170425-F-WZ808-001C.JPG Photo Gallery