Usually the mere announcement of such a plan is enough to find enough volunteers but there do exist a handful of such conscripted firefighter troops. Often this is necessary after a mass resignation of volunteers such as in Helsa, Hessia this year.

This is actually quite similar to Singapore. Except here Conscripts make the majority with full time firefighters closely behind. There are a few volunteer firefighters, but they are a few. I myself was a conscript, it was a very valuable experience. I guess one thing holding back people from volunteering is the work culture here. Also in general firefighters aren't as well respected (which is kind of really sad).

Here in austria we have volunteer, fulltime and company firefighters. Altough wikipedia says those exist for germany too.

And apparently germany has a "Werkfeuerwehr" too, which is different too.

https://de.wikipedia.org/wiki/Betriebsfeuerwehr