United Nations Security Council
Along with the five permanent members, the Security Council of the United Nations has temporary members that hold their seats on a rotating basis by geographic region. Non-permanent members may be involved in global security briefings. In its first two decades, the Security Council had six non-permanent members, the first of which were Australia, Brazil, Egypt, Mexico, the Netherlands, and Poland. In 1965, the number of non-permanent members was expanded to ten.
Chapter VII of the United Nations Charter
Chapter VII also gives the Military Staff Committee responsibility for strategic coordination of forces placed at the disposal of the UN Security Council. It is made up of the chiefs of staff of the five permanent members of the Council.