User blog comment:Rappy 4187/Technical Update: March 23, 2016/@comment-25648422-20160324031506/@comment-24258073-20160324035259

By default, Roll-backers and Bureaucrats don't have their own user tags. But both tags can be added using Java Script. However Roll-backers unlike other user groups don't have their own MediaWiki:User-identity-box-group page, so their user tag title can't be customised.