Re: Americans in the RAF in 1940
Up to 25% of the "flying crew or ground crew, or pen pushers or whatever" in the RAF at any time during the War were RCAF, or "Canadians" wearing RAF uniforms. Many of the Yanks in both the RAF and RCAF prior to Pearl Harbour would be listed as "Canadians", since that is where they signed up. Because of paperwork practices like this, it may not be possible to ever confirm or deny your number.
Bottom line: your total of 10,000 Americans is fairly believable, based on the few hard facts I am aware of. It is very believable if you include RCAF members serving with the RAF.
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