United Nations Security Council
The UN officially came into existence on 24 October 1945 upon ratification of the Charter by the five then-permanent members of the Security Council and by a majority of the other 46 signatories. On 17 January 1946, the Security Council met for the first time at Church House, Westminster, in London, United Kingdom.
Mixed Armistice Commissions
Sixty years ago on that date, the United Nations Security Council established the first peacekeeping operation, the United Nations Truce Supervision Organization (UNTSO), based in the Middle East. In 2001, the General Assembly proclaimed 29 May as the International Day of United Nations Peacekeepers to pay tribute to the men and women who serve in United Nations peacekeeping operations and honour the memory of those who have lost their lives in the cause of peace.