The write up does say "
A few Sherman IIIC
are believed to have existed" and at the time that was added to the info years ago up until today you are the first to point out they did not.
DO NOTE we do not have any IIIc Fireflys actually IN THE GAME for the reason stated above
.......and it was I who told Shrapnel nobody else has ever had a problem turning ID tags off in Preferences because it's us they ask when things like this occur.
There is a hotkey listed in the in-game help file (K) but it does not work and we can find no code for it in the game but we are thinking about adding it in for the next release.
Also please remember to check the patch area for updates if your game is anything but v13. It *might* solve your problem
http://www.shrapnelgames.com/Camo_Wo.../WW2_page.html