The South African National Defence Force was created in 1994, as an all volunteer force composed of as the former South African Defence Force, the forces of the African nationalist groups (Umkhonto we Sizwe and Azanian People's Liberation Army), and the former Bantustan defence forces. The SANDF is subdivided into four branches, the South African Army, the South African Air Force, the South African Navy, and the South African Medical Service.

In recent years, the SANDF has become a major peacekeeping force in Africa, and has been involved in operations in Lesotho, the Democratic Republic of the Congo, and Burundi, amongst others. It has also participated as a part of multi-national UN peacekeeping forces.

South Africa undertook a nuclear weapons programme in the 1970s and may have conducted a nuclear test over the Atlantic in 1979. It is the only African country to have successfully developed nuclear weapons. It has become the first country (followed by Ukraine) with nuclear capability to voluntarily renounce and dismantle its programme and in the process signed the Nuclear Non-Proliferation Treaty in 1991.