United States's defence budget is the highest in the world. The defence budget of United States is estimated at US$731,751M at around 3.40% of its GDP. Its percentage of GDP allocated to defence spending is the highest in North America.
United States has the largest military force in North America. United States has a military that is composed of 1,388,100 active personnel (third-largest in the world) and 844,950 in reserve, totalling 2,233,050 or 6.8 military personnel per 1000 in population.
United States's battle tank force is the largest in North America. On land, United States has a mobile force of 8,850 tanks. For aerial defence, United States has an air force of 14,061 military aircrafts and 3,720 attack helicopters.United States's naval fleet is the second-largest in the world. United States has a naval fleet of 254 vessels, including 11 aircraft carriers and 70 nuclear submarines. The naval fleet of warships also include 21 frigates, 69 destroyers and 27 corvettes.