U.S. Air Force Staff Sgt. Hilary Middleton, 355th Operations Support Squadron aircrew flight equipment technician, laughs with teammates while preparing to start the All-Star Jamboree in Tucson, Ariz., August 10, 2013. Middleton has been a member of the Tucson Roller Derby since 2011. (U.S. Air Force photo by Airman 1st Class Betty R. Chevalier/Released)