At first, Gowon was sent to a boot camp north of Kampala, Uganda's capital, where Amin was training a new elite unit. Obote considered this new unit a potential threat, however, and ordered its disbandment. As result, Gowon was reassigned to the military police, and later to the paratroopers trained by Israeli experts. At some point after 1969, he was among those sent to Greece for a course in commando tactics. In 1971, Amin launched a coup d'état and installed himself as President, though Obote found refuge in Tanzania. Amin's military dictatorship promptly purged the army of all those who were believed loyal to Obote, including most Acholi and Langi. The vacant leadership positions were then filled with soldiers who were loyal to Amin and usually from the West Nile Province. Gowon returned to Uganda after the coup's conclusion, and was promoted to major and appointed second-in-command of the Simba Battalion, stationed at Mbarara. Another Ugandan ex-officer later commented that Gowon was not prepared for such a promotion, and was just appointed because he belonged to Amin's own tribal group and religion. With the President as his personal patron, Gowon held great power over the Simba Battalion, probably more than the official commanding officer, Colonel Ali Fadhul.