This one served in the same unit as the one you are skinning, and my info indicates the camo and markings would have been the same. Its a P-39 delivered with the Soviet stars on the a/c by Bell.
http://hsgalleries.com/p39qbv_1.htmMany late war US P-39s like these were delivered in standard US olive drab (as usual), with Soviet markings applied at the Bell factory, this one seems to be one of those (as well as Major Rents a/c).
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Just for info:
...Most P-39s were delivered with US markings, which is why on many (although not all) you see the green overspray and the red stars over top on the fuselage (the default P-39Q skin as an example), or the US blue circle with the white US star over painted red, or in other cases they used a white circle with a red star design. Depended on the model and year.
My info is that the versions that did have the US markings overpainted, did not typically have the red stars on the upper surfaces, just the lower (again as per the P-39Q default skin).
Later versions that did have them on the upper wings were delivered that way to the Russians by Bell, which I guess the Russians just left them on.