You already acknowledge this elsewhere, and you've also already acknowledged that there's special meaning to the red cross as opposed to merely referring to pharmacies.
I don't know what you're doing excluding Asia or the USA either, while saying
> A green cross would confuse no one.
And then following up with
> I'm sorry, but if your only example is the US then you're likely to be wrong about a lot of things.
I didn't exclude Asia, I stated that my experience there is more limited than the continents I listed. The US isn't a reliable authority on any international standards.
If you started up a new video game and the health packs had green crosses instead of red ones, would you be confused?