Es, If they were captured as armed civilians on the battlefield, then there is a special section of the GC dealing with them. (in short, they have no GC protection)

If they were captured for another reason, then they should get trials. Military trials were accepted practice in these cases previously, and the USSC has just set out the map to follow to do just that. Now if congress would just get off their tuckusses and actually DO something, maybe there can be some progress.