Agree with you on the US contribution Old-Duffer.
I well remember 20-something years ago waking to the news that the USAF had been requested to assist with a casevac at some great distance out in the Western Approaches. While having breakfast I heard an uncommon sound and went out into the garden to see a pair of MH-53s thunder over at rooftop height on their way. A little later they were followed by their Hercules tanker at a more conventional altitude. Spent the rest of the day visualising an MH-53 in RAF SAR yellow.