to strengthen the UN's capacity for preventive diplomacy and peacekeeping. French nationals have served as Under-Secretaries-General for Peacekeeping Operations since 1997. Cyprus The United Nations Buffer Zone in Cyprus is a demilitarized zone, patrolled by the United Nations Peacekeeping Force in Cyprus (UNFICYP), that was established in 1964 and extended in 1974 after the ceasefire of 16 August 1974, following the Turkish invasion of Cyprus, and the de facto partition of the island into the area controlled by the Republic of Cyprus (excluding the Sovereign Base Areas) and the largely unrecognized Turkish Republic of Northern Cyprus in the North. The zone, also known as the Green Line (, Prasini Grammi; ), stretches for from Paralimni in the east to Kato Pyrgos in the west, where a separate section surrounds Kokkina. India-Pakistian The United Nations India-Pakistan Observation Mission (UNIPOM), is peacekeeping mission set up by the Security Council in September 1965 to oversee the ceasefire and withdrawal of armed personnel along the India–Pakistan border. Facilities Potential sites for the UN Headquarters included Vienna, Switzerland, Berlin, Quebec, and the Netherlands before the delegation decided on a headquarters in the United States by December 1945. Many U.S. locations vied for the honor of hosting the UN Headquarters site, such as Marin County, California; St. Louis; Boston; Chicago; Fairfield County, Connecticut; Westchester County, New York; Flushing Meadows-Corona Park in Queens; Tuskahoma, Oklahoma; the Black Hills of South Dakota; Belle Isle in Detroit; and a site on Navy Island straddling the U.S.-Canada border. San Francisco, where the UN founding conference was held, was favored by Australia, New Zealand, China, and the Philippines due to the city's proximity to their countries. The UN and many of its delegates seriously considered Philadelphia for the headquarters; the city offered to donate land in several select sites, including Fairmount Park, Andorra, and a location in Center City, Philadelphia, that would have placed the headquarters along a mall extending from Independence Hall to Penn's Landing. In 1946, John D. Rockefeller III and Laurance Rockefeller each offered their respective residences in Kykuit in Mount Pleasant, New York, as headquarters for the UN, but the proposals were vetoed as the sites were too isolated from Manhattan. The Soviet Union vetoed Boston due to the denunciations of Soviet expansion by John E. Swift, a Massachusetts judge and Supreme Knight of the Knights of Columbus. Prior to the completion of the UN's current headquarters,