(From Right to Left) Tops in Blue Vocalists Airmen 1st Class Barry Smith and Quentin Thomas sing during this year's Tops in Blue concert held at the Rushmore Plaza Civic Center in Rapid City, S.D., June 19. Tops In Blue Airmen perform an average of 120 performances at 100 locations worldwide each year. (U.S. Air Force photo/Airman Corey Hook)(Released)