A B-52 Stratofortress from Barksdale Air Force Base, La. arrives at Eielson AFB, Alaska, May 31 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)