The Pioneer is the same as the Shadow that I mentioned in my post. They are not flying in controlled airspace, employing ordnance, etc.

They are also not checking in with JTAC's and being cleared into the same ROZ stacks as Vipers, Strike Eagles, gunships, etc. Just as RC modelers don't need to file flightplans, neither do these guys. Of course, there are associated limitations on where they are allowed to fly. It's a big battlespace and everyone has their part.