[Seruzawa]

That is still disputed. The 262 had compressibilty problems at mach .86 and the pilot would lose control.

[Captain Walker]

It's a wartime claim and certainly nothing that could have been carved in stone under the conditions Germany was in during April of 1945.

But as I've said here, there was sufficient evidence of the veracity of the claim that the official wording that described Chuck Yeager's accomplishment has since been amended to allow for it.