Posted 7/28/2007An F-15C Aggressor from the 65th Aggressor Squadron at Nellis Air Force Base, Nev., flies over a mountain range on a refueling mission at Red Flag-Alaska July 25. Red Flag-Alaska enables aviation units to sharpen their combat skills by flying simulated combat sorties in a realistic threat environment. More than 80 aircraft and 1,500 servicemembers from six countries are participating in the exercise July 12 to 27. (U.S. Air Force photo/Capt. Tana Stevenson)