EIELSON AIR FORCE BASE, Alaska -- Senior Airman Joseph Matulka, 57th Aircraft Maintenance Squadron, Nellis Air Force Base, Nev., turns on an air compressor in the process of trying to find a leaking hose on an F-15 July 19. Red Flag-Alaska provides training for deployed maintenance and support personnel in sustainment of a large-force deployed air operation. (U.S. Air Force photo by Airman 1st Class Christopher Griffin)