"In the summer of 1982, at the request of the Lebanese government, the United States agreed to establish a U.S. Military presence in that country to serve as a peacekeeping force in the conflict between warring Muslim and Christian factions. On March 24, 1983, the 24th Marine Amphibious Unit, stationed at Camp Lejeune, North Carolina, received orders to Beirut, Lebanon in support of that commitment.
Initially, the U.S. Forces, along with French and Italian Forces, provided a measure of stability; however, as diplomatic efforts failed to achieve a basis for a lasting settlement, the Muslim factions came to perceive the Marines as enemies. This led to artillery, mortar, and small arms fires being directed at the Marine Corps positions — with appropriate, measured response being taken against identified targets. In the early morning of October 23, 1983, the First Battalion, 8th Marines Headquarters building was destroyed by a non-Lebanese, terrorist-driven truck, laden with compressed gas-enhanced explosives. This truck, like many others, had become a familiar sight at the airport and so did not raise any alarm on this morning. The resulting explosion and the collapse of the building killed 241 Marines, Sailors, and Soldiers.