In taking a decision consideration must be given to the needs of national air defence.

It was responsible for transport, reconnaissance, and rotary-wing aircraft as well as the national air defence system.

National Air Defence Corps of Nigeria.

As Programme Director, he has spearheaded the concept of theatre defence systems and integration of national Air Defence elements.

The IJN Air Service had the mission of national air defence, deep strike, naval warfare, and so forth.

The weapon system can also use surveillance data from other systems, data from optical surveillance and from the general aerial picture from the national air defence communications system.

A Chinese JY-11 Radar low/medium altitude 3D surveillance radar has been installed since 2008 as part of the National Air Defence System of Sri Lanka.

It is a fully coherent pulse-compression radar with a high reliability and mobility and can provide low-flying target information for national air defence information networks or for AAA or air traffic control systems.

The Air Defense Command, based at SLAF Katunayake, is the SLAF command responsible for coordination of air and ground units to maintain integrated national air defence.

Operation Centre National Air Defence (de: Nationales Lage- und Führungszentrum für Sicherheit im Luftraum - NLFZ SiLuRa)

The 5th Air Army of the Soviet Air Forces provided tactical air support for the District's units and the 49th Air Defence Corps, 8th Air Defence Army was tasked with national air defence for the territory.

In 1951, as a result of rising tensions in the Cold War, the Royal Canadian Air Force established an air base at North Bay, part of an expanding national air defence network to counter the threat of nuclear attack against North America by Soviet bombers.

The HTAF headquarters is also responsible for Greece's national air defence and the search and rescue operations within the Athens FIR, and has operational control over the air defence units of the Hellenic Army and the Hellenic Navy as well.

While the defence cuts of the mid 1960s led to the cancellation of the P.139, work continued on a wholly British designed radar system, while strategic thinking led to a decision being taken that the RAF needed an AEW aircraft to operate as part of the national air defence strategy.