According to NATO sources in 2008, Greece spent 2.8% of GDP on its military, which translated to approximately €6.9 billion. In 2008, Greece was the largest importer of conventional weapons in Europe and its military spending was the highest in the European Union relative to the country's GDP, reaching twice the European average. Data for the 2017 fiscal year showed an estimated expense of €4.3 billion in constant 2010 prices, or €4.2 billion in current prices, equivalent to 2.38% of GDP. For the 2018 fiscal year, the expenditure was estimated at €4.3 billion in constant 2010 prices or €4.1 billion in current prices, equivalent to 2.27% of GDP.
The Hellenic National Defense General Staff has the operational command of the Joint Armed Forces Headquarters and the units that operate under them. It is also responsible for organising and implementing routine operations and exercises of the Joint Armed Forces, coordinating and implementing operations during the management of wartime and peacetime crises and overseeing operations of the Hellenic Armed Forces outside Greek national territory.
Hellenic Army
The basic components of the Hellenic Army are Arms and Corps. The former is responsible for combat missions and the latter for logistical support. It is organized in Commands, Formations, and Units with the main being brigade, division and corps. Its main mission is to guarantee the territorial integrity and independence of the country.
Hellenic Navy
The Hellenic Navy incorporates a modern fleet consisting of strike units, such as frigates, gunboats, submarines and fast attack guided missile vessels and multiple types of support vessels, in order to be able to conduct naval operations that protect Greek national interests and guarantee the integrity of Greek territorial waters, the mainland and the islands.
The Hellenic Air Force incorporates a modern aircraft fleet and congruent structure, combined with a comprehensive air defense system that consists of a widespread network of anti-aircraft weapons. The structure, which is overseen by the Air Force General Staff, includes the Tactical Air Force Command, the Air Force Support Command, the Air Force Training Command and a number of other independent defense units and services. Its main mission is to defend Greek airspace and to provide combat support to the Hellenic Army and the Hellenic Navy.