If you are talking about the non-uniformed combatants, it is my understanding that the U.S. is according them the same POW status as uniformed combatants.
That is a call that our leadership is making. We are not legally required to do so.
In WWII for example, such freelancers were often executed right where they were captured. They are legally classifiable as spies or clandestine agents.
By the way. The definition of "uniform" in this legal sense refers to an insignia or emblem in plain view, which identifies the wearer to be part of a unit under a nation's military command structure.
You do not have to be dressed completely from hat to boots to be "in uniform" in this narrow legal definition.