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
United Nations Secretary-General selection plan to bypass the Security Council by having the General Assembly President carry out the duties of Secretary-General. After a week of negotiation, the Soviet Union and the United States agreed on U Thant of Burma to take over Hammarskjöld's role. However, the two superpowers deadlocked for four weeks on how many Assistant Secretaries-General there would be, with the United States insisting on five, and the Soviet Union proposing three, four, six, or seven. The deadlock was finally broken when the superpowers agreed to let Thant decide for himself. Thant was unanimously selected Acting Secretary-General for the remainder of Hammarskjöld's