The South African Air Force (SAAF) is the air warfare branch of South African National Defence Force, with its headquarters in Pretoria. The South African Air Force was established on 1 February 1920. The Air Force saw service in World War II and the Korean War. From 1966, the SAAF was involved in providing infantry support in the low-intensity Border War in Angola, South-West Africa and Rhodesia. As the war progressed, the intensity of air operations increased, until in the late 1980s when the SAAF were compelled to fly fighter missions against Angolan aircraft in order to maintain tactical air superiority. On conclusion of the Border War in 1990, aircraft numbers were severely reduced due to economic pressures as well as the cessation of hostilities with neighbouring states.