And lobbying, don't forget. I'd bet the likes of General Dynamics, Lockheed, etc... collectively spend over a billion dollars every year lobbying the government.
That is an extreme underestimate.
Honestly it probably is - but I have no idea how much they collectively spend each year buying our government, so I figured a few billion would be a good number.
The real number is probably in the double-digit billions across the entire defense sector.