I'm not a big fan of the training unit japanese planes, but they have a credible argument for inclusion. Some others, I won't get into.
We have a P-47 in RAF garb that was from an OTU (operational training unit) -- but I think the key there was the "operational." There was some discussion about it when it was created, but I don't recall all of it.
Which spitty skin are you thinking of? Might help to jog folks' memories and clear the air.