State Parties undertake not to nurture, harbour or support any person, group of persons or institutions whose aim is to destabilise the political, military, territorialand economic or social security of a State Party. ARTICLE 9 Defence Cooperation In order to realise the objective of this Pact, State Parties shall co-operate in defence matters and facilitate interaction among their armed forces and defence-related industries in the following and any other areas of mutual interest: a) the training of military personnel in any field of military endeavour and, to that end, they may from time to time hold joint military exercises in one another's territory; b) exchange military intelligence and information in all relevant matters subject to any restrictions or otherwise of national security; and c) joint research, development and production under license or otherwise of military equipment, including weapons and munitions, and to facilitate the supply of, or the procurement of defence equipment and services among defence-related industries, defence research establishments and their respective armed forces. ARTICLE 10 Supplementary Agreements State Parties may, in respect of any particular issue covered by the provisions of this Pact, make such subsequent agreements, of a specific or general nature, as would, in their opinion, enhance the effective implementation of this Pact. ARTICLE 11 Implementation 1. State Parties shall receive delegations of Member States for the purpose of consultation regarding implementation of any aspect of this Pact. 2. The Secretariat of the SADC Organ shall co-ordinate the implementation of this Pact. ARTICLE 12 Confidentiality 1. State Parties undertake not to disclose any classified information obtained in the implementation of this Pact, or any other related agreements, other than to their own staff, to whom such disclosure is essential for purposes of giving effect to this Pact or such further agreements pursuant to this Pact. 2. State Parties further undertake not to use any classified information obtained during any multilateral cooperation among them to the detriment of or against the interests of any State Party. 3. Visiting personnel shall, in the implementation of this Pact, comply with the security regulations of the host State Party and any information disclosed or made available to such visiting personnel shall be treated in accordance with this Article. 4