United Nations System
There are 15 members of the Security Council, consisting of five veto-wielding permanent members (China, France, Russia, the United Kingdom, and the United States) and 10 elected non-permanent members with two-year terms. This basic structure is set out in Chapter V of the UN Charter. Security Council members must always be present at UN headquarters in New York so that the Security Council can meet at any time.
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.