 Complete the following phrase:  Lumago worked as a customs official before being recruited into the Uganda Army in 1963 by British officers. After undergoing training at the Sudanese Military Academy in Omdurman, he was made a second lieutet and posted to Moroto. He underwent additional training over the following years and received steady promotions. By 1971 he held the rank of captain, and he was supportive of Colonel Idi Amins 