U.S. Air Force Staff Sgt. Brooke Hairston, 743rd Intelligence Support Squadron client systems craftsman, sings a Billie Holliday cover during the 2015 Tops in Blue World Tour Aug. 28, 2015, at the Abilene Civic Center in Abilene, Texas. As part of their show, Tops in Blue performed songs from popular artists from each decade of the 20th century. (U.S. Air Force photo by Senior Airman Kedesha Pennant/Released)