Operation Prone was a proposed military operation by the South African Defence Force (SADF) and South West African Territorial Force (SWATF) during the South African Border War and Angolan Civil War between May and September 1988. With the advance of the 50th Cuban Division towards Calueque and the South-West Africa border, the SADF formed the 10 SA Division to counter this threat. The plan for Operation Prone had two phases. was to be a counterinsurgency phase and a conventional phase.