While I can see that this may be confusing to those who have not seen this, the Kruger tag was added to prevent confusion with the rheinland military ships in normal operations. As outlined in the role play between the rheinland military and Kruger, the two gunboats are protecting kruger miners in the upper omega-7 region.
As we had in the beginning, without the tag, these gunboats were continuosly called up to hamburg, new berlin, and anywhere to support. This did not suit the roleplay outlined for these ships. So everyone would easily see RNC-Blitz and RNC-Donner's principal mission, they were tagged.
Anything more that needs answering?
Ps. Quite funny that the only people complaining about this are the people who are the main target for Thunder and Lightening (For those that do not know the translation of Donner and Blitz).