A joint Navy-Air Force-Marine Corps mission assigned by Ronald Reagan that began on April 15, 1986 to punish Libyan President Qaddafi for his involvement in the death of American citizens and to discourage him from further support of international terrorism. One of the aircraft used in El Dorado was an HARM-carrying F/A-18C Hornet tasked with taking out Libyan air defenses in advance of F-111 strike aircraft.