In 1981 one of three corps headquarters for the ground forces was situated at Hargeisa in the northwestern Woqooyi Galbeed region. Others were believed to be garrisoned at Galkacyo in the north-central Mudug region and at Beledweyne in the south-central Hiiraan region. The ground forces were tactically organized into seven divisions. Allocated among the divisions were three mechanized infantry brigades, ten anti-aircraft battalions, and thirteen artillery battalions. The classified supplements to the CIA World Factbook for the 1980s, released thirty years later, show that the CIA estimated that the force had grown to eleven divisions by January 1984, and twelve divisions by 1986.