F-16s with the U.S. Air Force Air Demonstration Team Thunderbirds fly the arrowhead loop Nov. 13, 2009, during the 2009 Aviation Nation Nellis Air Force Base, Nev., open house. The Thunderbirds are the Air Force's premier demonstration squadron and represent the Air Force throughout the nation and abroad. (U.S. Air Force photo by Tech. Sgt. Michael R. Holzworth)