I personally oppose the USA having a private military companies (PMC) doing the work of the US Military on any level. It might seem like a good idea and, it makes great numbers when talking about the amount of troops the USA has in a particular theater for, the listed number does not include PMC. This enables those in Washington to play it fast and loose with the actions of the US Government.
My big fear is their allegiance is not to the US Government or its people but, rather the corporation or its stock holders.
I don't mind a private military "IF", it is done such as the French Foreign Legion. A military unit that permits the French Government to take actions and if people start to die, many of them are not young French people. It is a little more agreeable to the French public.
Whatever a country does other than a few 'special forces' type actions, everything should be truthful or up front.
There are questions of which need to openly debated. If a soldier of a PMC shoots a civilian in a foreign country, if it is deemed a homicide, which organization has jurisdiction over that defendant? If a group of PMC soldiers run amoke (like My Lai 5 massacre in Viet Nam), how culpable would the country be? What happens when a theater commander needs the PMC soldiers to do one thing but, their company wants them to do something else in order to save money.
On a military mission, all involved should be subjected to the military commander on-scene.
IMHO