KEYNOTE SPEAKER Defense Secretary Leon E. Panetta shakes hands with keynote speaker Rev. Samuel "Billy" Kyles after he delivered a speech during the 27th annual ceremony to honor Martin Luther King Jr. at the Pentagon, Jan. 26, 2012. Kyles, a civil rights activist, knew King and was in his presence when he was assassinated in Memphis, Tenn., April 4, 1968. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 835546-B-GZB54-089.jpg Photo Gallery