Leaders Rendering Honors Navy Adm. Mike Mullen, left, chairman of the Joint Chiefs of Staff, President Barack Obama and Defense Secretary Robert M. Gates salute during the playing of the national anthem at the Pentagon Memorial during a Sept. 11, 2010, ceremony marking the ninth anniversary of the 9/11 terrorist attacks. DoD photo by Cherie Cullen SHARE: Download: Full Size (0.91 MB) Credit: Cherie Cullen VIRIN: 100911-D-7203C-007.JPG Photo Gallery