150917-A-WU705-076W
Secretary of Defense Ashton Carter, left, Air Force Gen. Paul Selvas, vice chairman of the Joint Chiefs of Staff, Spc. Aleksander Skarlatos, center, Airman 1st Class Spencer Stone and Anthony Sadler descend a staircase in the courtyard of the Pentagon for a ceremony where Skarlatos, Stone and Sadler received awards for thier actions in subduing a heavily armed gunman on a Paris-bound train.