Defense Secretary Ash Carter, left, pins the Airman's Medal on the lapel of Air Force Airman 1st Class Spencer Stone, center and Air Force Gen. Paul Selva, vice chairman of the Joint Chiefs of Staff, stands at attention during a ceremony at the Pentagon Sept. 17, 2015, honoring him for his role in stopping a gunman on a Paris-bound train outside of Brussels. DoD Photo by Glenn Fawcett