Blackwater USA, the private security firm with contracts and operations in Iraq, is in big trouble these days. They're under investigation for a September 16th shooting in Iraq that left 11 civilians dead.
Proponents say these private security firms are efficient and have the resources to take limited jobs like, say, protecting a construction site, off the hands of the U.S. military.
Critics say they aren't held to the same standards as the military and that they have a myopic focus on fulfilling their contracts, often at the expense of bigger goals (like winning the hearts and minds of the Iraqis).