An F-16 Fighting Falcon (left), F-15 Eagle (front), F-4 Phantom
(right) and an A-10 Thunderbolt II (back) fly in a diamond
formation over Tucson, Ariz., Sunday, March 5, 2006, during the
2006 Heritage Conference. The conference combines different U.S.
aircraft from more than 60 years of aviation history to ensure
certification in performing air shows worldwide. [U.S. Air Force
photo by Airman 1st Class Veronica Pierce]