Tracked vehicles and vehicles with lights and sirens are free to individuals in Germany? That's pretty new to me.
Good pictures though.
plenty of people in the UK own old military vehicles as well, especially old CVRT or FV432 series.
I assume, like in the UK, any sort of blue lights, fake weapons etc have to be removed when traveling on the public roads and then placed on again when on private land/shows. All the tracked stuff tends to come in on flat bed trailers.