A B-52 Stratofortress from Barksdale AFB, La. arrives at Eielson Air Force Base, Alaska, May 31, 2009 in support of Northern Edge 2009. Northern Edge is Alaska's largest military training excercise. The exercise is held over a two-week period, involving components from the Army, Marines, Navy, and Air Force. (U.S. Air Force photo/Staff Sgt. Tia Wilson)