The General Assembly, in its resolution 57/129, designated 29 May as the International Day of United Nations Peacekeepers.
This is the date when in 1948 the first UN peacekeeping mission named the "United Nations Truce Supervision Organization", or UNTSO began operations in Palestine.
It was established to monitor the ceasefire after the Arab-Israeli War of 1948.
The day was designated on official request of the Ukrainian Peacekeepers Association and Government of Ukraine to the UNGA.
It was first celebrated in 2003.
The theme for the 2018 International Day of UN Peacekeepers is “70 Years of Service and Sacrifice.”