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.
Military Staff Committee
The MSC consists of army, naval and air force representatives from the Security Council's five permanent members (China, France, Russia, the UK and the U.S.) who meet every 14 days at the headquarters building of the UN in New York City. Additional United Nation members are included in meetings regarding peacekeeping operations in which their country's forces are deployed.