The North Atlantic Council (NAC) is the principal political decision-making body of the North Atlantic Treaty Organization (NATO), consisting of permanent representatives of its member countries. It was established by Article 9 of the North Atlantic Treaty, and it is the only body in NATO that derives its authority explicitly from the treaty. Powers and duties. The North Atlantic Treaty gave the NAC the power to set up subsidiary bodies for various policy functions, including a defense committee to implement other parts of the treaty. Since 1952, the NAC has been in permanent session.
https://en.wikipedia.org/wiki/North_Atlantic_Council