Navy SEALs train during Northern Edge 2009
A group of Navy SEALs prepare to cross Phelan Creek during Northern Edge 2009 June 17 at Fort Wainwright, Alaska. Northern Edge is a large-scale exercise hosted in Alaska to improve command, control and communications between the armed services. The Northern Warfare Training Center and the SEALs worked together on river crossing techniques and rope handling. (U.S. Air Force photo/Staff Sgt. Christopher Boitz)