Secretary-General of the United Nations the appointee's national origin and to gender equality, although no woman has yet served as Secretary-General. The length of the term is discretionary, but all Secretaries-General since 1971 have been appointed to five-year terms. Every Secretary-General since 1961 has been re-selected for a second term, with the exception of Boutros Boutros-Ghali, who was vetoed by the United States in the 1996 selection. There is a term limit of two full terms, established when China cast a record 16 vetoes against Kurt Waldheim's third term in the 1981 selection. No Secretary-General since 1981 has attempted to secure a third term. The
Secretary General of the Union of South American Nations Secretary General of the Union of South American Nations The Secretary General of the Union of South American Nations is the legal representative of the Secretariat of the Union of South American Nations (USAN). The position was established by the UNASUR Constitutive Treaty and the first Secretary General was designated on 4 May 2010. The Secretary General of UNASUR is proposed by the Foreign Ministers council, and designated by the Heads of State and Government council for a two-year term, renewable once. A Secretary General cannot be of the same nationality in succession. The Secretary General exercises the legal representation