Aerial Refuel An Air Force KC-135 Stratotanker prepares to refuel a C-17 Globemaster III near Fairchild Air Force Base, Wash., Sept. 17, 2019, during Mobility Guardian, a large scale mobility exercise. SHARE: Download: Full Size (1.53 MB) Tags: Air Force, Mobility Guardian Credit: Air Force Tech. Sgt. Larry Reid Jr. VIRIN: 190917-F-KA253-0242C.JPG Photo Gallery