The military-industrial complex is always feeding at the trough when we throw billions at defense and offense and 'nation building.' Trigger-happy presidents are usually the biggest recipients of their investment.
Some of those corporations are corrupt, but it's not only some corporations.
Some departments of the government are flagged as unreliable bookeepers.
This article is too big to paste here, but worth reading.
The Pentagon cannot account for $1,100,000,000,000(!!!)
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http://articles.findarticles.com/p/articles/mi_m1571/is_2003_Sept_2/ai_106909386