UNTSO was established in 1948 to monitor ceasefires and supervise truce agreements in the Middle East, specifically between India and Pakistan.

The United Nations established peacekeeping operations in 1950 to help maintain peace and security in conflict-affected areas around the world.

UNEF I was a peacekeeping mission initiated by the United Nations in November 1956 and concluded in June 1967.

UNOGIL was a short-term United Nations mission conducted from June 1958 to December 1958 in Lebanon for observation purposes.

ONUC was a United Nations peacekeeping mission in the Congo aimed at maintaining law and order during the country's independence and post-independence period.

While carrying out the UN mission in the Congo, Secretary-General Dag Hammarskjold was killed in an air crash. His death was a significant event during the UN's involvement in the region.

UNYOM was a United Nations mission that took place from June 1963 to September 1964 to observe the situation in Yemen.

UNFICYP was created in 1964 to prevent further fighting between the Greek Cypriot and Turkish Cypriot communities in Cyprus.

In 1965, the UN dispatched the United Nations India-Pakistan Observation Mission (UNIPOM) to monitor the areas of the India-Pakistan border that were not being monitored by the earlier mission, UNMOGIP, following a ceasefire in the Indo-Pakistani War of 1965.

In 1967, a UN force was established to monitor the armistice agreement between Egypt and Israel after the war, during a period of high tension.

UNEF II was a peacekeeping mission established by the United Nations in October 1973 and lasted until July 1979.

In 1974, a smaller UN force was set up on the Golan Heights to maintain the boundary line between Syrian and Israeli forces.

UNIFIL was formed in 1978 after the Israeli invasion of Lebanon, with tasks including overseeing Israeli withdrawal and helping the Lebanese government re-establish authority.

In the 1980s, the UN authorized the UNIIMOG mission to oversee the withdrawal of troops from the Iraq-Iran border after years of conflict between the two countries.

In 1988, the UN Peacekeeping Forces were honored with the Nobel Peace Prize for their efforts in maintaining peace and security in various conflict regions. This recognition highlighted the significant role played by these forces in global peacekeeping.

UNTAG was a United Nations peacekeeping mission in Namibia aimed at facilitating the country's transition to independence from South Africa.

UNAVEM I was a United Nations peacekeeping mission deployed to verify the withdrawal of foreign forces from Angola and to assist in the national reconciliation process.

UNIIMOG was a United Nations mission deployed from August 1988 to February 1991 to observe and report on the ceasefire between Iran and Iraq following the Iran-Iraq War.

In 1992, the UN established the Department of Peacekeeping Operations to meet the growing demand for peacekeeping missions and support global peace efforts.

Disagreements in the UN Security Council led to a failure in preventing the genocide that occurred in Rwanda in 1994.

UNPROFOR was a United Nations peacekeeping force deployed in the former Yugoslavia from February 1992 to March 1995 to provide humanitarian aid and protect civilians during the Yugoslav Wars.

UNCRO was a United Nations peacekeeping mission that aimed to restore confidence and stability in Croatia between March 1995 and January 1996.

UNTAES was a United Nations transitional administration established in January 1996 to oversee the peaceful reintegration of Eastern Slavonia, Baranja, and Western Sirmium into Croatia after the Croatian War of Independence.

UNSMIH was a United Nations mission in Haiti aimed at providing support for the professionalization of the Haitian National Police.

MONUA was a United Nations observer mission established to monitor the peace process in Angola following the end of the civil war.

MINUGUA was a United Nations mission in Guatemala tasked with verifying compliance with peace agreements and promoting human rights in the country.

UNTMIH was a United Nations mission in Haiti focused on facilitating the transition to democracy and supporting the Haitian government.

UNCPSG was a United Nations mission that provided civilian police support in various regions, operating from January 1998 to October 1998.

MINURCA was a United Nations peacekeeping mission that aimed to help stabilize the Central African Republic during a period of political turmoil.

UNOMSIL was a United Nations observer mission that monitored the situation in Sierra Leone and supported peacebuilding efforts.

UNAMSIL was a United Nations peacekeeping operation in Sierra Leone that played a crucial role in restoring peace and stability to the country.

UNMEE was a peacekeeping mission established by the United Nations to monitor the ceasefire agreement between Ethiopia and Eritrea.

MINUCI was a United Nations peacekeeping mission deployed to help implement the Linas-Marcoussis Agreement in Côte d'Ivoire.

UNIKOM was a United Nations mission that monitored the demilitarized zone between Iraq and Kuwait from April 1991 to October 2003 following the Gulf War.

ONUB was a United Nations peacekeeping mission aimed at supporting the implementation of the Arusha Peace and Reconciliation Agreement in Burundi.

MINUSTAH was a United Nations peacekeeping mission in Haiti aimed at stabilizing the country and fostering a secure environment for reconstruction and development.

UNMIS was established in 2006 to support the implementation of the Comprehensive Peace Agreement in Sudan.

The 2008 capstone doctrine entitled 'United Nations Peacekeeping Operations: Principles and Guidelines' builds on the Brahimi analysis to reform UN peacekeeping operations.

By May 2010, UN Peacekeeping had entered a phase of consolidation, with a slight decline in troop numbers in missions like MONUSCO and MINURCAT.

UNMISS was established in 2011 to consolidate peace and security and to help establish conditions for development in South Sudan.

UNSMIS was a United Nations mission established in April 2012 to supervise the implementation of a ceasefire agreement in Syria during the Syrian Civil War.

MINUSMA is a United Nations peacekeeping mission in Mali that focuses on stabilizing the country and protecting civilians.

In October 2014, the UN Secretary-General created a 17-member High-level Independent Panel on UN Peace Operations to evaluate the current state of UN peace operations and address future needs. The panel's report, known as the HIPPO report, was released in June 2015 with key recommendations for the future of peace operations.

The HIPPO report, issued in June 2015, provided key recommendations for the future of UN peace operations based on a comprehensive assessment conducted by the High-level Independent Panel on UN Peace Operations.

In September 2015, the UN Secretary-General released a report on the implementation of the recommendations outlined in the HIPPO report and discussed the future of peace operations based on these recommendations.

On 20 October 2016, former Under-Secretary-General for Peacekeeping Operations, Hervé Ladsous, and Under-Secretary-General for Field Operations, Atul Khare, presented an overview of ongoing operations, strategic context, priorities, and challenges facing peacekeeping to the General Assembly's Fourth Committee.

MINUJUSTH was a United Nations mission in Haiti focused on supporting the country's justice system and strengthening the rule of law.

As of April 2018, the United Nations has authorized 71 peacekeeping operations. These operations do not include interventions like the Korean War and the Gulf War.

With the evolving dynamics of world politics and warfare trends, peacekeeping operations face increasing challenges in facilitating political processes, protecting civilians, assisting in disarmament, demobilization, and reintegration of former combatants, supporting election organization, promoting human rights, and restoring the rule of law.