https://www.thenation.com/article/pentagon-audit-budget-fraud/
In all, at least a mind-boggling $21 trillion of Pentagon financial transactions between 1998 and 2015 could not be traced, documented, or explained, concluded Skidmore. To convey the vastness of that sum, $21 trillion is roughly five times more than the entire federal government spends in a year. It is greater than the US Gross National Product, the world’s largest at an estimated $18.8 trillion. And that $21 trillion includes only plugs that were disclosed in reports by the Office of Inspector General, which does not review all of the Pentagon’s spending.