An audit of Defense Department employees and contractors with "high security clearances" finds that "83,000 people owe $730 million in back taxes."

According to the Government Accountability Office, the DOD probably has no idea who these scofflaws are because the IRS doesn't share information freely.

The GAO warned the debt burden could be a dangerous “vulnerability” to the US because strapped workers might be tempted to sell secrets to foreign governments.

“You only want to give a clearance to someone who is trustworthy. But if they are financially extended, they are at risk,” said GAO spokesman Steve Lord.