-ammo-,
The P-51B entered active service in December 1943, and thus squeaked in. You are right, the P-47 should be there too. It was not intended as a complete list. I'm pretty sure the P-38J was in service in 1943, if not it'd be out of the list a replaced by a P-38H. The information that I have seen indicates that the Ki-44IIb was active in 1943. Mitsu would know more I think.
It was the lack of a really good German counter to the P-51B/Spitfire LF.Mk IX and La-5FN that really put a damper on my idea.
An MW50 equipped Bf109G-6 would have been what I was looking for, but I couldn't find evidence of one before 1944. That seems to have been backed up by guys who know more about the 109 in this thread.
