The Principal Policy and Decision-making Institutions of the Alliance Key to the Principal NATO Committees 7. Joint Committee on Proliferation (JCP) Members All member countries. Chairman Deputy Secretary General. Role Senior advisory body providing coordinated reports to the North Atlantic Council on politico-military and defence aspects of the proliferation of weapons of mass destruction. Levels Members of the Senior Politico-Military Group on Proliferation (SGP) and the Senior Defence Group on Proliferation (DGP) meeting in joint session. Principal Subordinate Committees N/A. International Staff Support Division of Political Affairs; Division of Defence Planning and Operations; Executive Secretariat.