The Principal Policy and Decision-making Institutions of the Alliance Key to the Principal NATO Committees 12. Political Committee at Senior Level (SPC) Members All member countries. Chairman Assistant Secretary General for Political Affairs. Role Senior advisory body of the North Atlantic Council on political and specific politico-military questions. Reinforced with experts when dealing with some issues (SPC(R)). Levels Deputy Permanent Representatives. Principal Subordinate Committees N/A International Staff Support Division of Political Affairs; Executive Secretariat and other IS Divisions/Offices as required.