 Complete the following phrase:  Marines returned to Beirut during the 1982 Lebanon War on 24 August with the arrival of the 32nd Marine Amphibious Unit later redesignated as 22nd Marine Expeditionary Unit and the Multinational Force in Lebanon MNF. As part of a peace treaty, the Palestine Liberation Organization was withdrawn to Tunisia, and the Marines returned to their ships. Due to increased violence from the still-ongoing Lebanese Civil War, President Ronald Reagan ordered the Marines to return on 29 September in the form of 2nd Battalion 8th Marines. Relieved by 3rd Battalion 8th Marines in October, the MNF increasingly drew fire from different factions. The 