9/11 TRIBUTE WALL Chairman of the Joint Chiefs of Staff U.S. Navy Adm. Mike Mullen looks at a tribute wall to 9/11 victims at Ground Zero in New York City, Sept. 12, 2008. Mullen toured the 9/11 crash site the day after giving a speech during the Pentagon Memorial Dedication in Washington, D.C., for 9/11 victims. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 615568-F-NCC48-866.jpg Photo Gallery