Officially Tanzania has no compulsory military service in the armed forces and has never had since achieving independence. The armed forces consist of volunteers.  
But from 1963 onwards, Tanzania has had National Service, which involves military training, and which has a compulsory character. Those who have performed National Service are considered to belong to the military reserve forces. In the past they have been called up during the war in Uganda to fight the Idi Amin regime.