Obama, Hagel and Dempsey Salute Flag During 9/11 Commemoration President Barack Obama, right, Defense Secretary Chuck Hagel, center, and Army Gen. Martin Dempsey, chairman of the Joint Chiefs of Staff, salute the American flag as the national anthem plays during the ceremony to commemorate 9/11 at the Pentagon, Sept. 11, 2014. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 122595-S-CRU62-433.jpg Photo Gallery