History of the United Nations $8.5 million donation from John D. Rockefeller, Jr. The UN headquarters officially opened on January 9, 1951, although construction was not formally completed until October 9, 1952. Under special agreement with the United States, the UN enjoys certain diplomatic privileges and immunities, but generally the laws of New York City, New York State, and the United States apply. While the principal headquarters of the UN remain in New York City, major agencies base themselves in Geneva, The Hague, Vienna, Nairobi and elsewhere. The basic constitutional makeup of the United Nations has changed little, though vastly increased membership has altered the
United Nations Special Service Medal United Nations Special Service Medal The United Nations Special Service Medal (UNSSM) is presented to personnel with 90 days of service with a United Nations mission not covered by a specific United Nations Medal. United Nations Headquarters service is not eligible. The following is an incomplete listing of eligible missions which qualify for the Special Service Medal: The UN Special Service Medal is a circular bronze medal 35 mm in diameter. The obverse depicts the official emblem of the United Nations, a world map oriented from the north pole. Above the emblem are the letters UN. The reverse is plain