A U.S. Air Force C-17 Globemaster III makes its final approach over the Kentucky Air National Guard firehouse in Louisville, Ky., April 20, 2012. The Kentucky Air National Guard Base is once again serving as the launching pad for military aircraft slated to appear in this weekend's 22-annual Thunder Over Louisville air show. The schedule features more than 25 current military planes and helicopters from the U.S. Armed Services and Canadian military, as well as variety of historic war birds. Highlights include the F-22 Raptor, a B-2 Stealth Bomber and F/A-18 Hornets.