I picked up a soldbuch that came with a dog tag.

Since the Germans put units on their dog tags, I presume they had to reissue them when a soldier was transferred? And, judging by all the soldbuchs and wehrpasses I’ve seen, that can happen fairly often. Still, it was hard enough for them to keep up with awards and entries into documents, so it seems hard to believe they actually did this. Did they reissue them, or did the soldier just keep the one they were first issued with as they moved about?

Thanks guys!