U.S. Air Force A-10 Thunderbolt II aircraft, assigned to the 354th Fighter Squadron Davis-Monthan AFB, Ariz., sits on the flight line ready for takeoff during Angel Thunder in Tucson, Ariz., on Oct. 17, 2011. Approximately 1,400 U.S. military, federal and state employees and coalition forces are participating in the 6th Annual Angel Thunder Exercise in Tucson, Ariz. Angel Thunder is the world's largest military search and rescue exercise in the world.