Night Refueling An F-16E Strike Eagle closes in on a KC-135 Stratotanker for aerial refueling during Exercise Mobility Guardian above central Washington, Sept. 11, 2019. Mobility Guardian provides airmen with the training to deliver a more rapid global response. SHARE: Download: Full Size (4.69 MB) Tags: Air Force, Mobility Guardian Credit: Air Force Senior Airman Charles Fultz VIRIN: 190912-F-PI321-0107.JPG Photo Gallery