Once upon a time I read that you are able to customize the LSPDFR's backup and create your own types of units to arrive.
However, I can't seem to find how to exactly do that, if that even possible and I am not fooling myself.
For context, I want to create an LSPD SWAT backup with Riot and 4 SWAT models from EUP, if you can guide me how to do it as well, i'll be very gratefull !