The Executive Council shall appoint a permanent Secretariat and staff and may appoint joint committees chosen from the Body of Delegates or consisting of specially qualified persons outside of that Body, for the study and systematic consideration of the international questions with which the Council may have to deal, or of questions likely to lead to international complications or disputes. It shall also take the necessary steps to establish and maintain proper liaison both with the foreign offices of the signatory powers and with any governments or agencies which may be acting as mandatories of the League of Nations in any part of the world. ARTICLE III The Contracting Powers unite in guaranteeing to each other political independence and territorial integrity; but it is understood between them that such territorial readjustments, if any, as may in the future become necessary by reason of changes in present racial conditions and aspirations or present social and political relationships, pursuant to the principle of self-determination, and also such territorial readjustments as may in the judgment of three fourths of the Delegates be demanded by the welfare and manifest interest of the peoples concerned, may be effected if agreeable to those peoples; and that territorial changes may in equity involve material compensation. The Contracting Powers accept without reservation the principle that the peace of the world is superior in importance to every question of political jurisdiction or boundary. ARTICLE IV The Contracting Powers recognize the principle that the establishment and maintenance of peace will require the reduction of national armaments to the lowest point consistent with domestic safety and the enforcement by common action of international obligations; and the Delegates are directed to formulate at once plans by which such a reduction may be brought about. The plan so formulated shall be binding when, and only when, unanimously approved by the Governments signatory to this Covenant. As the basis for such a reduction of armaments, all the Powers subscribing to the Treaty of Peace of which this Covenant constitutes a part hereby agree to abolish conscription and all other forms of compulsory military service, and also agree that their future forces of defence and of international action shall consist of militia or volunteers, whose numbers and methods of training shall be fixed, after expert inquiry, by the agreements with regard to the reduction of armaments referred to in the last preceding paragraph. The Body of Delegates shall also determine for the consideration and action of the several governments what direct military equipment and armament is fair and reasonable in proportion to the scale of forces laid down in the programme of disarmament; and these limits, when adopted, shall not be exceeded without the permission of the Body of Delegates.