Georgia's military is organized into land and air forces. They are collectively known as the Georgian Defense Forces (GDF). The mission and functions of the GDF are based on the Constitution of Georgia, Georgia's Law on Defense and National Military Strategy, and international agreements to which Georgia is signatory. The military budget of Georgia for 2021 is 900₾ ($) million. The biggest part, 72% of the military budget is allocated for maintaining defence forces readiness and potency development. After its independence from the Soviet Union, Georgia began to develop its own military industry. The first exhibition of products made by STC Delta was in 1999. STC Delta now produces a variety of military equipment, including armoured vehicles, artillery systems, aviation systems, personal protection equipment, and small arms.