November 18, 2013 2:18 PM

How does the Pentagon keep track of its $500 billion budget?

The U.S. Defense Department's budget is larger than the next 10 military spenders (including countries like Russia and China) — combined. The Pentagon hasn't undergone a full audit of its books in two decades. A large part of the computer code which powers crucial military payroll and accounting systems was written in the 1960s.

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