For use on posts with the NSDAP emblem or SS Insignia (sigrunen) runes/uniforms, or otherwise clear nazi markings such as the totenkopf (death's head).
Note that "SS inspired" but imaginary uniforms do not qualify for the tag, nor does general german WW2 imagery, such as the eagle and swastika, iron cross, or German Military units and equipment, unless they fit the earlier mentioned criteria.