Bundeswehr :
Major General doubts army service with out obligatory components

dpa
First, a voluntary army service is sufficient. In the long run, nonetheless, the “limits of voluntariness” are pushed, says the commander of the house safety division Andreas Henne.
https://www.faz.net/aktuell/politik/inland/bundeswehr-generalmajor-zweifelt-an-wehrdienst-ohne-pflichtelemente-110514098.html