“„Total spending by the U.S. government and other contractors for security provided by contractors in Iraq from 2003 through 2007 was between $6 billion and $10 billion, CBO estimates. As of early 2008, approximately 25,000 to 30,000 employees of private security contractors were operating in Iraq. Those contractors worked for the U.S. government, the Iraqi government, other contractors, and other customers. private security contractors (PSCs).