Combined Air Defense

Combined air defense refers to the doctrinal and operational arrangement under which allied or partner states pool sensors, command-and-control nodes, interceptor aircraft, and surface-to-air missile (SAM) batteries to defend a common volume of airspace. The term is closely related to, but broader than, integrated air defense system (IADS): "combined" emphasizes multinational participation, while "integrated" emphasizes the technical fusion of sensors and shooters.

Core elements typically include:

• Shared early-warning radar coverage, often layered between ground-based long-range radars and airborne early-warning aircraft.
• A common air picture distributed via secure data links such as Link 16, allowing aircraft and SAM operators from different nations to see the same tracks.
• Pre-agreed rules of engagement and identification-friend-or-foe (IFF) procedures to prevent fratricide.
• A combined air operations center (CAOC) where officers from contributing nations exercise tactical control.

The most developed example is NATO's Integrated Air and Missile Defence System (NATINAMDS), descended from the NADGE network of the 1960s, which places national air policing assets under SACEUR's operational command during peacetime. Other arrangements include the bilateral US–Canadian NORAD command established in 1958, and Gulf Cooperation Council efforts since the 2000s to link Patriot and THAAD batteries among member states, though full integration there has lagged.

Combined air defense raises distinct legal and political questions. Sovereignty over national airspace under the Chicago Convention (1944) is not surrendered; rather, states delegate specific tactical authorities while retaining the right to withhold consent for kinetic action. Interoperability also depends on technical standardization—NATO STANAGs being the most cited framework—and on intelligence-sharing agreements that govern radar feeds and threat libraries.

For MUN and policy researchers, the concept is relevant to debates on extended deterrence, ballistic missile defense in Europe and East Asia, and the security architecture of regions such as the Baltic states, Korea, and the Persian Gulf.