U.S. Air Force 1st Lt. Oliver Chang, Space and Missiles System Center developmental engineer, plays the violin during the 2015 Tops in Blue World Tour Aug. 28, 2015, at the Abilene Civic Center in Abilene, Texas. Tops in Blue was established in 1953 to recognize the high caliber of amateur entertainment available within the Air Force. (U.S. Air Force photo by Senior Airman Kedesha Pennant/Released)