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If regional partnership and interoperability with Japan was an important consideration, Australia would not have selected the French design for their submarine programme.
I'm just trying to set expectations on the likelihood of any tie-up on a frigate design. Australia is about to make a decision based on worked that has been carried out over many years whilst the US announced their programme only very recently. The requirements are also very different as Australia want heavy emphasis on world leading AWS and other lead ship and forward area capabilities. The US have more of a general purpose requirements set. What you seem to be implying is that US would follow Australia's lead on selecting a frigate design - this is simply not going to happen.The big point of difference for me in the SEA 5000 contenders is not the mission bay but that the FREMM and F100 are still in the running in the US FFG(x) programme while Type 26 is not.
The US is our major Pacific partner and interoperability with US forces as well as those from South Korea and Japan must be an important consideration in defence procurement. I would expect our Government to be across the reasons for the non inclusion of the Type 26 in the FFG(x) programme and to take those reasons into consideration when making the decision on the successful bidder. Don't you find it curious that the US has not included it while we have?
Similarly, it would be naïve to think the US may have an interest in the SEA 5000 programme especially considering US companies are heavily involved.
If regional partnership and interoperability with Japan was an important consideration, Australia would not have selected the French design for their submarine programme.