Operation Reindeer, which began on 4 May 1978, was South Africa's second major military operation in Angola, carried out under the Apartheid regime, the first being Operation Savannah.

The Battle of Cassinga also known as the Cassinga Raid or Kassinga Massacre was a controversial South African airborne attack on a South West Africa People's Organization (SWAPO) military camp at the town of Cassinga, Angola on 4 May 1978. Conducted as one of the three major actions of Operation Reindeer during the South African Border War, it was the South African Army's first major air assault operation.