US Ambassador Schieffer promised Australia would have the best EXPORTED F-35 specifications
From the Australian government, we know the Australian F-35 has a beach ball-size RCS (0.15-0.25 m2).
The Canadian government has corroborated the Australian government's claim.
Now, I want to prove that the Japanese F-35 is not better than the Australian and Canadian F-35s.
According to former US Ambassador Schieffer, Australia will receive the BEST EXPORTED F-35. This means the Japanese F-35 cannot exceed the Australian F-35 in performance.
This makes sense. Australia is a white country and Japan is not. It would be extremely unusual if a FIVE EYES country (Australia, Canada, New Zealand, United Kingdom, and United States) received an exported F-35 inferior to a non-FIVE EYES country like Japan.
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US Ambassador Schieffer makes two points to the Parliament of Australia. Firstly, Australia will receive the BEST EXPORT version of the F-35. Secondly, the Australian F-35 is DIFFERENT from the American F-35.
JOINT STANDING COMMITTEE ON FOREIGN AFFAIRS, DEFENCE AND TRADE | Parliament of Australia (June 21, 2004)
"Ambassador Schieffer —I think the joint strike fighter will be the best airplane that has been built and it will be without peer in the world. The fact that Australia is in the development stage of it will be extraordinarily beneficial to Australia in the long run. It gives you an airplane quicker than it would be if you were not in the development phase. It guarantees you that you will get the best airplane that is available to anybody. It also gives you the opportunity to have input into what kind of airplane it will be.
With regard to the stealth technology, the airplane that Australia will get will be the stealthiest airplane that anybody outside the United States can acquire. We have given assurances to Australia that we will give you the absolute maximum that we can with regard to that technology. Having said that,
the airplane will not be exactly the same airplane as the United States will have. But it will be a stealth fighter; it will have stealth capabilities; and it will be at the highest level that anyone in the world has outside the United States."