Nice. I did not know the shark/snake mouth was "restricted" to certain units. How about the hog mouth? Or am I just imagining things?
As far as I know...
Shark teeth (FT) = (Flying Tigers). Moody AFB, GA. A-10s with teeth, but also a C-130 FT with teeth, and HH-60G Pavehawks with teeth as CCTs.
Blacksnakes (IN) = 122nd FW Indiana ANG. Fort Wayne, Indiana
Flying Razorbacks (FS) = 188FW, Arkansas ANG. Fort Smith, Arkansas. Razorback Warthog face
Warthog face (BD) = Barksdale AFB, 917th Wing/47thFS Dogpatchers,
These are the only "faces" authorized as of this posting.