During the late 1970s and early 1980s, the 31st MEU engaged in humanitarian operations, for example the floods in Bangladesh (1984). In 1983, the 31st MEU was recalled from a combined exercise with local forces in Kenya, and positioned in the Mediterranean Sea. Its mission from September to October 1983 was to support the Multinational U.S. peacekeeping forces in Beirut during an intense period of complex political and life-threatening conditions in Lebanon. They took over the command operations after their sister unit (24th MEU) was attacked in the Beirut bombing. It was the 31st MEU's last military operation of that period and the unit was deactivated in May 1985 on ship off the shore of San Diego. During this time the 31st MEU was based at the Marine Barracks, Subic Bay Naval Station.