F-16 Fighting Falcons from Iowa and Ohio Air National Guard units sit ready on the flightline at Eielson Air Force Base, Alaska, on Tuesday, June 6, 2006, during Exercise Northern Edge 2006. The joint training exercise hosted by Alaskan Command is one of a series of U.S. Pacific Command exercises that prepare joint forces to respond to crises in the Asian Pacific region. (U.S. Air Force photo/Staff Sgt. Joshua Strang)