Hi F4UDOA,
Very fair treatment you give the P-51 there :-)
Maybe an interesting perspective for you: The original "Secret Weapons of the Luftwaffe" game manual had an interview with a historian who maintained that the USA wouldn't really have needed the P-51 (despite its obvious qualities) since they already had a fighter of comparable range and performance in service - the F4U :-) However, since this was a Navy aircraft, the USAAF, suffering from the Not Invented Here syndrome, the USAAF failed to employ it.
Personally, I believe this might be a bit of a simplification considering the problems generally inherent in procurement, but as you are our resident F4U expert, I'd like to hear your opinion on this :-)
Regards,
Henning (HoHun)