Print both parts in the orientation of the STL files. You will require supports under the lanyard slots and maybe along the centre of the inside of the RSA pocket depending upon your bridge settings.
It was printed at 0.2mm layer height in black PLA.
Once printed, remove the unwanted bridging material with a sharp knife and clip the RSA pocket into the ID badge holder.
There are 2 lanyard slots so it can be used either way round.
Edit 31/10: I've added a new ID holder that hangs vertically from one end.
The author marked this model as their own original creation.