18th Chairman of the Joint Chiefs of Staff Army Gen. Martin E. Dempsey joined Secretary of Defense Chuck Hagel and President Barrack Obama in hosting the Pentagon Observance Ceremony, Sept. 11, 2013. The event was invitation-only for survivors and family members of those who lost their lives after the 9/11 event at the Pentagon twelve years ago. DoD photo by Army Staff Sgt. Sean K. Harp