Cassinga Day is observed in Namibia every May 4, commemorating the Battle of Cassinga, which took place on this date in 1978 during the South Africa Border War. The battle involved an attack by the South African air force on Cassinga, an abandoned town in Angola used by the South West Africa People's Organization (SWAPO) as a military base and refugee camp. This tragic event resulted in the deaths of approximately 600 individuals, including many civilians, children, and women. The nature of the attack has sparked debate regarding whether it was a legitimate military operation or a massacre of innocent civilians. In Namibia, Cassinga Day is marked by solemn ceremonies held at Heroes' Acre, the official war memorial located outside the capital, Windhoek, and attended by the President and other political figures.