From Reddit:

I thought this kind of puts things in perspective. In 2010, the US government collected $898 billion in federal income tax revenues. The same year, we spent $847 billion on useless wars and national defense. That means that 94% of all federal income tax revenue is equivalent to what we spend on the Pentagon. Who out there thinks it was money well spent?

Also, just to piss you off a little bit more - defense spending is equivalent to 443% of what we collect in total corporate taxes.

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Hidden cost of war in Afghanistan:

Short video on the unseen and often uncalculated costs of war.