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
Under-Secretary-General of the United Nations does not use the title of Under-Secretary-General. USGs have diplomatic rank equivalent to that of a national cabinet minister. Under Article 105 of the United Nations Charter they have diplomatic immunity. With over 50 people with the rank of Under-Secretary-General, unsurprisingly the influence and power they wield within the UN System varies dramatically. The most important USGs, controlling budgets, programmes or key activities, are also members of the Secretary-General's Senior Management Group, whose objective is to ensure strategic coherence and direction in the work of the Organization. The cabinet was approved by the General Assembly in 1997 as part of