Global Firepower ranks Russia as having the second-most-powerful military force in the world, trailing only the US, and this is with a population base that is half as large. Russia is listed as having just under 70 million people available for military service, with just under 47 million who are deemed fit for service. It has 850,000 active personnel and 250,000 in reserve, for a total of 1,350,000, according to Global Firepower, while the IISS's Military Balance estimates Russia's active personnel strength to be 900,000. The CIA World Factbook also gives figures of 200,000 to 250,000 Federal National Guard (ie reservists) and 850,000 full-time military personnel, which it breaks down into 375,000 ground troops, of which 40,000 are airborne; 150,000 in the Russian Navy; 160,000 Aerospace Forces; 160,000 Strategic Rocket Forces and approximately 90,000 other uniformed forces, including 20,000 special operations forces.