Everyone knows that a lot of money is wasted by the Pentagon, but the amount of this waste is staggering, making most of the fraud reported by the media paltry by comparison. Scot Paltrow puts things in perspective:

The DOD has amassed a backlog of more than $500 billion in unaudited contracts with outside vendors. How much of that money paid for actual goods and services delivered isn’t known.
Over the past 10 years the DOD has signed contracts for provisions of more than $3 trillion in goods and services. How much of that money is wasted in overpayments to contractors, or was never spent and never remitted to the Treasury is a mystery.
The Pentagon uses a standard operating procedure to enter false numbers, or “plugs,” to cover lost or missing information in their accounting in order to submit a balanced budget to the Treasury. In 2012, the Pentagon reported $9.22 billion in these reconciling amounts. That was up from $7.41 billion the year before.