New York Headquarters will observe the International Day of United Nations Peacekeepers on Thursday, 27 May. Secretary-General António Guterres will lay a wreath to honour the more than 4,000 United Nations peacekeepers who have lost their lives since 1948 and preside over a ceremony at which the Dag Hammarskjöld Medal will be awarded posthumously to 129 military, police and civilian peacekeepers from 44 countries, who lost their lives serving under the United Nations flag in 2020 and in the first month of 2021.