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King's African Rifles

Amin joined the King's African Rifles (KAR) in 1946 as an assistant cook, while at the same time receiving military training until 1947. In later life he falsely claimed to have served in the Burma Campaign of World War II. He was transferred to Kenya for infantry service as a private in 1947, and served in the 21st KAR infantry battalion in Gilgil, Kenya Colony until 1949. That year, his unit was deployed to northern Kenya to fight against Somali rebels. In 1952, his brigade was deployed against the Mau Mau rebels in Kenya. He was promoted to corporal the same year, then to sergeant in 1953.

In 1959, Amin was made Effendi Class 2 (Warrant Officer), the highest possible rank for a black soldier in the KAR. Amin returned to Uganda the same year and received a short-service commission as a lieutenant on 15 July 1961, becoming one of the first two Ugandans to become commissioned officers. He was assigned to quell the cattle rustling between Uganda's Karamojong and Kenya's Turkana nomads. According to researcher Holger Bernt Hansen, Amin's outlook, behavior and strategies of communication were strongly influenced by his experiences in the colonial military. This included his direct and hands-on leadership style which would eventually contribute to his popularity among certain parts of Ugandan society.