The economy of scale
An interesting graphic representing the budget of the United States for 2008. In the interests of scale and context: the New Zealand GDP (our total output - rather the government spending budget) is about 106 billion dollars. The budget for the US Air Force alone is 136 billion dollars. The budget for farm subsidies is 15 billion (give or take a hundred million) - do we subsidise our farmers?.
The map is worth checking out online. You can move around and zoom into the detail in a sort of google earth kind of way.