This article by the U.K. Guardian puts it in perspective:

[T]he United States spent a staggering $607bn (£402 bn) on defence in 2008. Currently engaged in what will likely be the longest ground war in US history in Afghanistan. Harbourer of thousands of nuclear weapons. 1.5m soldiers. Fleets of aircrafts, bombs and seemingly endless amounts of military technology.

I know that many Americans would read the above paragraph with pride and contentment. I consider it succinct evidence that we are a paranoid war-mongering nation. I consider these enormous military expenditures tragic, considering all of the other things that we could and should be doing with most of that money.