Sadly, (shades of 'U-571' and many others before and since), if Hollywood ever did make a movie of Rick Rescola's life, that fact that he was a Brit would be erased, he'd speak with a mid-western American twang, and he'd still have a six pack for a stomach in 2011. (I suspect that many a six pack went into making the stomach he did have by then!)
It's by no means a recent phenomenon. Back in WW2, few in the Pacific theatre would have argued that Australian cameraman Damien Parer was anything but the war cameraman par excellence. When his excellent newsreels of the New Guinea campaign were shown in the US, (there was no 'real time' sound attached to the film), he was shown repeatedly on camera in Brit pattern winter battle dress, explaining the footage just seen or about to be seen), they dubbed his (quite educated and easily understood) Australian accent with an American voice. At every step, MacArthur went out of his way to paint the picture that anything positive coming out of his area of operations was 100% American.