U.S. Air Force airmen perform maintenance on an F-15 Eagle fighter aircraft. U.S. Air Force airmen from the 3rd Aircraft Maintenance Squadron, 3rd Wing, Elmendorf Air Force Base, Alaska, perform maintenance on an F-15 Eagle fighter aircraft before takeoff during exercise Northern Edge 2009 on June 17, 2009. Northern Edge 2009 is Alaska's largest military training exercise. It prepares joint forces to respond to crises throughout the Asia-Pacific region. SHARE: Download: Full Size (0.03 MB) Credit: VIRIN: 114857-B-JQQ97-201.jpg Photo Gallery