The history of the SANDF can be traced back to 1912, with the establishment of the Union Defence Force (UDF). In 1957, the Union Defence Force was renamed to the South African Defence Force (SADF). The SADF fought a bloody guerrilla war against the South-West African People's Organisation (SWAPO) and the African National Congress in South-West Africa (now Namibia). SADF forces were also involved in the Angolan Civil War. In 1994, the South African Defence Force was combined with the ANC's Umkhonto we Sizwe (MK), the PAC's Azanian People's Liberation Army (APLA), several Bantustan defence forces, and the self protection units of the Inkatha Freedom Party to form the South African National Defence Force.