U.S. Army Soldiers working on a UH-60 Black Hawk helicopter

U.S. Army Soldiers working on a UH-60 Black Hawk helicopter take a brief break from work to watch a U.S. Air Force F-16 Fighting Falcon taxi past their position as the fighter pilot prepares to take off from Allen Army Airfield at Fort Greely, Alaska, shortly before an airfield seizure scenario is executed as part of Exercise Northern Edge, June 17, 2015. Northern Edge 2015 is Alaska's premier joint training exercise designed to practice operations, techniques and procedures as well as enhance interoperability among the services. Thousands of Airmen, Soldiers, Sailors, Marines and Coast Guardsmen from active duty, reserve and National Guard units are involved. (U.S. Air Force photo by Master Sgt. Karen J. Tomasik/Released)