The United States Air Force Air Demonstration Squadron, Thunderbirds, demonstrate the calypso pass during Aviation Nation Nov. 11, 2012, at Nellis Air Force Base, Nev. Aviation Nation is an opportunity for the Las Vegas community to view aerial demonstrations and static displays of various aircraft from the military. The open house also acts as the final show of the year for the U.S. Air Force Aerial Demonstration Squadron, Thunderbirds. (Senior Airman Daniel Hughes/U.S. Air Force)