A new Pentagon study is warning the Obama administration about overspending in Afghanistan by revealing that the US Army wasted billions of dollars on the Iraq war.“The US administration spent billions of dollars by employing a large number of private sectors in Iraq, the report released by German website Welt Online said. More than 60 percent of Americans working for US Defense Department in Afghanistan are from private sectors, according to the report. Last week, the Congressional Research Service reported that the surge of 30,000 US troops into Afghanistan could vastly expand the presence of personnel from the US private sector. The report noted that it expects an additional 26,000 to 56,000 contractors to be sent to Afghanistan. That would bring the number of contractors in the country to anywhere from 130,000 to 160,000. There are currently 104,000 Defense Department contractors working in Afghanistan under Pentagon supervision, the study said.”