About the Stukas, since Axis & Allies is all about terristrial combat (especially Europe) I think the designers wanted to represent mainly ground attack aircraft and to my knowlege Bf-109s and Me-190s were almost exclusively intercept and air attack craft. Of course it would follow that the Russians should get Il-2s and the British should get Hurricanes or Typhoons but unfortunately these craft are virtually unkown to most people. The stuka, on the other hand, is one of the most widely recognized ground attack aircraft ever. I don’t have anything to say about the naval units, not really up on my naval history at all.