U.S. Defense Secretary Leon Panetta (C) leaves his challenge coin on a grave stone during a wreath laying ceremony with U.S. ambassador to Libya Gene Crets (obscured, 3rd L) and U.S. Army General Carter Ham, Commander of U.S. Africa Command (2nd L), at the graves of 13 U.S. Navy sailors, during a ceremony at the Protestant Cemetery in Tripoli December 17, 2011. Panetta visited the graves of the sailors who were killed on the USS Intrepid in 1804. REUTERS/Pablo Martinez Monsivais/Pool (LIBYA - Tags: POLITICS MILITARY)