Audience members react to a performance by Senior Master Sgt. Robert Harrelson and Master Sgt. Eric Sullivan Jr. perform during a concert featuring the U.S. Air Force Band’s Concert Band and Singing Sergeants at here at the College of DuPage in Glen Ellyn, Ill, April 4, 2014. The performance at the College of DuPage kicks off the band’s 2014 Spring Tour spanning three states. (U.S. Air Force photo/Master Sgt. Tammie Moore)