redsetter,
Are you seriously saying that the US would have prevented the RAF deploying US funded aircraft to Korea in the early 50's. Seeing as the US directly paid for numerous Hunters, Javelins, Canberras, Shackletons, Sabres, Neptunes Whirlwinds and Washingtons that would have been quite a restriction. I know that didn't happen, but it was a possibility for some time.
Operation Firedog in Malaya and then Confrontation with Indonesia as well as the long running saga in Aden just three instances of "out of area" with many of the types that the US paid for utilised, but up until maybe the mid to late 60's there is a strong argument that the RAF frontline was actually a lot further East than Europe.