We don't care. Approximately 0% of the American public believes the UK would help us if we were invaded, because we have eyes and have seen how absolutely degraded the European militaries have become, outside of a few outliers like Poland and Turkey.
I worked in the Pentagon for 10 years, and went over to the UK about twice a year for work at RAF Mildenhall, which, of course, is primarily filled with USAF planes and airmen.
European nations stopped caring about defending themselves, and turned NATO into a charity of which they are the recipients.
More recently (2016-2021), I would travel to London on a regular basis to work with a team based out of an office in Shoreditch. The sentiment of the average Londoner to the US military was fairly negative, typically accompanied by a face that looked like they had just smelled a fart.
My son is 18. I don't want him being drafted into any war on behalf of a demoralized population that doesn't want to fight for their own country. It's morally reprehensible to expect us to subsidize a society that has imprisons citizens for social media posts and fines our tech companies every chance they can get.