A KC-135 Stratotanker from the Alaska Air National Guard's 168th Air Refueling Wing waits as two F-22 Raptors from the 90th Fighter Squadron at Elmendorf Air Force Base, Alaska, fly in for refueling. With the KC-135's mission of air refueling, the F-22 can accomplish its mission of global engagement. (U.S. Air Force photo/Airman 1st Class Jonathan Steffen)