DIAMOND FORMATION

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11/13/2012 02:41 PM CST

The United States Air Force Air Demonstration Squadron, Thunderbirds, move from trail position into diamond formation during Aviation Nation 2012 over Nellis Air Force Base, Nev., Nov. 11, 2012. Aviation Nation celebrates 71 years of airpower in Las Vegas and the Air Force's accomplishments in air, space and cyberspace.