On October 26, 1983, a truck bomb exploded at the U.S. Marine barracks in Beirut, Lebanon, killing 241 American service members. The attack was carried out by Hezbollah, a Lebanese militant group supported by Iran, and was part of a series of bombings aimed at undermining U.S. influence in Lebanon. The bombing was one of the deadliest attacks on U.S. personnel at the time and led to a shift in U.S. military policy in the Middle East. The tragedy marked a pivotal moment in U.S.-Lebanon relations and was a precursor to the growing U.S. involvement in the Middle East during the 1980s.