CIA Factbook The World Factbook 1994: BurundiDefense Forces Branches: Army (includes naval and air units), paramilitary Gendarmerie Manpower availability: males age 15-49 1,315,660; fit for military service 687,474; reach military age (16) annually 67,949 (1994 est.) Defense expenditures: exchange rate conversion—$28 million, 3.7% of GDP (1989)