This is just an observation but as someone who has flown a lot in both UK and US airspace I find it difficult to see an argument blaming the USAF for the majority of TCAS warnings in either country.
In the US the powerful general aviation lobby ensures the us professionals get regular Ta/Ra alerts from lost low hour souls. In the UK this also happens but to a lesser extent. While I have had an airmiss with a dopey A-10 jockey most of the problems are due to very congested airspace around London, e.g. going in and out of LCY.
In conclusion I don't think it is quite fair to indentify USAF as the only culprits, I am just one poor descision away from being a culprit myself.
