On 29 May 1948, the United Nations Security Council, in its resolution 50 (1948) called for a cessation of hostilities in Palestine and established the first peacekeeping mission headed by a UN Mediator with the assistance of a group of military observers to be known as the United Nations Truce Supervision Organization (UNTSO). UNTSO is mandated to observe and maintain the unconditional ceasefires and assist the parties to the 1949 Armistice Agreements in the supervision of the application and observance of the terms of those Agreements. UNTSO's mandate covers five countries, including Egypt, Israel, Jordan, Lebanon, and the Syrian Arab Republic. The Field Language Assistant at the GS-5 Level reports directly to the Administrative Officer, Naqoura, Lebanon, under the overall supervision of the Chief of Mission Support.