wwrsimon,
What our more or less garrulous chums have tried to say, although not entirely effectively, is that sometimes it is not appropriate or even allowed to identify certain aspects of the ownership chain of some of the more exotic pieces of hardware. The catch all phrase for controlling sensitve information is "need to know'. If you have a reason to know, you will be in the loop, if you don't, you either won't or shouldn't be. This is based on the simple premise that the less people know about something sensitive, the more likely it is to stay sensitive.
It is often not the material itself, but how it was obtained that is the real sensitivity. So even if the public is fully appraised of let's say, the Hind's characteristics, that doesn't stop the source of that material remaining sensitive long after the fact. OBTW, just because material is on the interwebs doesn't mean it is legal and cleared for release, it just means someone has put it on a website. Bottom line, you can always ask, but you may not get an answer for good reason.