Private contractors in Kabul who work as security guards for the US embassy have been filmed living it up in nude and drunken revelry. They also have made unauthorized recon missions in Afghan neighborhoods.
Other private American contractors in Afghanistan are being investigated for diverting 20% of taxpayer money, to be used by them for specific tasks, being paid instead directly to the Taliban for protection. This protection money received by the Taliban can, of course, be used in their efforts to kill American soldiers.
It's comforting to see the marketplace at work, performing so much better than the United States Army ever could.