U.S. Air Force Staff Sgt. Anthony Fogle, 354th Operational Support Squadron, air traffic control, works on a computer inside the control tower during Exercise Northern Edge 15 at Eielson Air Force Base, Alaska, June 17, 2015. Northern Edge is Alaska’s premier joint training exercise designed to practice operations, techniques and procedures as well as enhance interoperability among the services. Thousands of participants from all services, Airmen, Soldiers, Sailors, Marines and Coast Guardsmen from active duty, Reserve and National Guard units are involved. (U.S. Marine Corps photo by Cpl. Suzanne Dickson/Not Released)