Well a search of the web provided some interesting results, it appears that there are more than a few CVO's out there , so it seems quite doubtful they can trademark the letter scheme, and without specific reference to motorcyles it appears HD would have a tough time to persue any legal action:
USGS Cascades Volcano Observatory (CVO)
Chigago Volkswagen Owners (CVO)
The College of Veterinarians of Ontario (CVO)
Circumventricular organs (CVO)
Constant Velocity of Ocala Inc.
CVO.ca - Canadian Virtual Office
Canadian Virtual Observatory
Central VA Orthopaedics
Covert Vampiric Operations
CVO Centrum Voor Volwassenen Onderwijs
and the list goes on ....
So COG may just work , now to persue the graphics ... hmmm
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