I see no provision in our constitution allowing for private armies. We have five branches of military and they must follow certain laws, even in combat. It costs many times more to have private companies perform tasks that are the realm of our military.
What are you doing to stop the use of private armies? What are you doing to insure they follow our laws and the laws of the country they operate in? What are you doing to hold them accountable, both in the billions of dollars we have paid them, and accountable for laws they have broken (murder comes to mind, torture too)?