According to a study led by Michigan State University professor Mark Skidmore, some $21 trillion in Pentagon accounting transactions, made over a 17-year period, lack supporting data. This doesn't mean the money is gone - the Pentagon only received roughly $9.2 trillion in budget money during that time - but it does mean the system is so choked with bad numbers, we have little idea of what mischief might be taking place at the Department of Defense. Double-billing [is] an alarmingly simple scheme. As Andy the Air Force accountant puts it: "A contractor accidentally invoices the military twice. It gets paid twice." For example, one company got paid in full for delivering just 28 percent of a lug-nut contract; or the Swiss contractor that supposedly over-billed by $757 million to supply the troops in Afghanistan. In one of the worst military scandals in recent history, a contractor called "Fat Leonard" reportedly bribed Navy officials with prostitutes and more than $500,000 in order to steer Navy boats to his portside service centers, where he systematically overbilled taxpayers. The ... grifter got more than $200 million in Navy contracts. On paper, the military can lose track of even big things - like 39 Black Hawk helicopters. But Andy thinks if independent analysts get to actually count the stuff that's supposed to be sitting in depots, this will [reveal] the true extent of the corruption and/or disorganization in the military.