You know, the average idiot (though I must admit that most of our liberal posters definitely aren't average) would know this story to be absolutely false simply by the math.
If we look at their chart, it would be reasonable to estimate that the DoD budget for the 17 years listed is about $500 billion/year, or in sum, $8.5 trillion in total - which just happens to be the amount in the "headline"
That means, the OP posits that every dollar spent on defense is unaccounted for. Not a single paycheck, not a single bullet, not a single gallon of gas, not a single airplane, ship, or tank is accounted for.
Forgive me if I snicker.