Why can't UK citizens join the US armed forces, Marines & why can't US citizens join the British Army, Royal Navy & Royal Air Force?

No language barrier; Two close intelligence sharing partners and part of five eyes; The special relationship; Dual past assistance, help and close co-operation in all major wars and conflicts of the past; Joint friendly and reliable allies; Culturally close. What is the big deal in having to hold a blue and gold... show more No language barrier;
Two close intelligence sharing partners and part of five eyes;
The special relationship;
Dual past assistance, help and close co-operation in all major wars and conflicts of the past;
Joint friendly and reliable allies;
Culturally close.

What is the big deal in having to hold a blue and gold or burgundy and gold passport, or why is that so essential and non negotiable to the overall recruitment and selection criteria?

It does not by itself make you a better performer.
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