From left, 2nd Lts. Colin Klopp, John Testerman and Ryan Douglas, assigned to 14th Student Squadron at Columbus Air Force Base, Miss., are members of the U.S. Air Force Academy’s a capella group, In the Stairwell. The group recently advanced to the semifinals of America’s Got Talent and will perform again on Sept. 12, 2017. (U.S. Air Force photo/Staff Sgt. Christopher Gross)