Interagency exercise kicks off
An F-15C Eagle taxis down the flightline May 7 at Elmendorf Air Force Base, Alaska, during a simulated alert launch as part of Alaska Shield/Northern Edge 2007. The exercise is part of the national level Ardent Sentry/Northern Edge 2007 -- a joint chiefs of staff-directed, U.S. Northern Command-sponsored homeland defense and Defense Support of Civil Authorities exercise. (U.S. Air Force photo)