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
1961 United Nations Secretary-General selection would have joined as co-sponsors, and the Soviet Union did not accept the participation of Nationalist China. The General Assembly voted that afternoon by secret ballot to accept the Security Council's recommendation. In a unanimous vote of 103-0-0, the General Assembly appointed U Thant as Acting Secretary-General of the United Nations for a term ending on 10 April 1963. U.S. Ambassador Adlai Stevenson announced in May 1962 that he would vote for Thant's re-election. Thant subsequently played a major role in resolving the Cuban Missile Crisis in October 1962. A second term was assured when Soviet Premier Nikita Khrushchev made