Chief of NGB swears in Guardsmen to begin Thunder air show
                Army Gen. Frank J. Grass, chief of the National Guard Bureau, swears in 20 Soldiers and Airmen from the Kentucky National Guard during a re-enlistment ceremony on the Clark Memorial Bridge in downtown Louisville, Ky., April 18, 2015. The event, televised live, kicked off the 2015 Thunder Over Louisville air show. (U.S. Air National Guard photo by Maj. Dale Greer)
                
                    
                        PHOTO BY:
                        Maj. Dale Greer
                    
                    
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