U.S. Secretary of Defense Leon Panetta (3rd L), U.S. Ambassador to Libya Gene Cretz (2nd L), and Gen. Carter Ham, Commander of U.S. Africa Command (L) bow their heads during the wreath laying ceremony at the grave site of 13 U.S. Navy sailors at the Protestant Cemetery in Tripoli December 17, 2011. REUTERS/Pablo Martinez Monsivais/Pool (LIBYA - Tags: POLITICS MILITARY)