Excerpt:

That brings our grand total to an astonishing $931 billion.

And this will turn out to be a conservative figure. We won’t spend less than that, but among other things, it doesn’t include the interest we’re paying on money we borrowed to fund past military operations; nor does it include portions of the National Aeronautics and Space Administration that are dedicated to national security. And we don’t know if this number captures the entire intelligence budget or not, because parts of intelligence funding are classified.

For now, however, that whopping $931 billion for fiscal year 2013 will have to do. If our national security budget were its own economy, it would be the nineteenth largest in the world, roughly the size of Australia’s. Meanwhile, the country with the next largest military budget, China, spends a mere pittance by comparison. The most recent estimate puts China’s military funding at around $136 billion.

http://www.thenation.com/article/168002/how-much-does-washington-spend-defense#