A U.S. Air Force F-16 Fighting Falcon aircraft assigned to the 13th Fighter Squadron, Misawa Air Base, Japan, taxis out during Exercise Northern Edge 2017, at Eileson Air Force Base, Alaska, May 4, 2017. Northern Edge is Alaska’s largest and premier joint training exercise designed to practice operations, techniques and procedures as well as enhance interoperability among the services. Thousands of participants from all the services—Airmen, Soldiers, Sailors, Marines and Coast Guard personnel from active duty, Reserve and National Guard units—are involved. - A U.S. Air Force F-16 Fighting Falcon aircraft assigned to the 13th Fighter Squadron, Misawa Air Base, Japan, taxis out during Exercise Northern Edge 2017, at Eileson Air Force Base, Alaska, May 4, 2017. Northern Edge is Alaska’s largest and premier joint training exercise designed to practice operations, techniques and procedures as well as enhance interoperability among the services. Thousands of participants from all the services—Airmen, Soldiers, Sailors, Marines and Coast Guard personnel from active duty, Reserve and National Guard units—are involved.