The Estonian Defence Forces is the unified military force of the Republic of Estonia. The Estonian Defence Forces consists of the Estonian Land Forces, the Estonian Navy, the Estonian Air Force, and the paramilitary Estonian Defence League. The national defence policy aims to guarantee the preservation of the independence and sovereignty of the state and maintain the integrity of its land area, territorial waters, airspace, and constitutional order. Its main goals remain the development and maintenance of a credible capability to defend the nation's vital interests and of the defence forces in a way that ensures their interoperability with the armed forces of NATO and European Union member states in order to participate in the full range of missions for these military alliances.