Now Justice Department investigators are said to be digging into hundreds of millions of dollars in deals made by major U.S. companies that supply the military with food, CBS News chief investigative correspondent Armen Keteyian reports.
According to the Wall Street Journal, the "large and active" fraud and corruption case reportedly focuses on:
Attorney Alan Grayson has filed dozens of lawsuits against military contractors, including PWC.
"The American taxpayer should be outraged because money is being wasted and our troops are not getting the supplies they should for the money that's being spent," Grayson said.
Based in Kuwait, PWC reportedly receives more than $1 billion a year to feed troops in Iraq. It has denied any wrongdoing, and says it has received positive reviews from government officials.
But in April Tyson Foods, one of the world's largest chicken producers, sent this letter to the Pentagon complaining that compeditors were getting "the appearance of personal favoritism" in selecting suppliers.
Sources tell CBS News that such complaints - dating back to late last year - may well have sparked the investigation - one of 78 such criminal probes of $5 billion in contracts now under review.