BARKSDALE AIR FORCE BASE, La. -- Children watch as Mig 17 demo pilot, Randy Ball, passes overhead during the Defenders of Liberty 2012 Air Show on Barksdale Air Force Base, La., April 21. More than 20 aerial acts were presented to the crowd throughout the air show, headlined by the U.S. Air Force Thunderbirds. (U.S. Air Force photo/Staff Sgt. Amber Ashcraft)