For sure one of the biggest needs. I did link to the DARPA project working on that now. I just didn't add it to my list because it is being worked on so aggressively.

Nearly everything on your list already exists and much is in limited use by the military already.

I think you missed the biggest item you missed is good hearing protection and sound suppression. In enclosed spaces all the normal issues with loud noises (i.e. guns and explosives) are massively magnified. In fact, it would be terrible to bring a dog much less a canary into this environment.

That would be nice, but AR needs precise positioning information, and GPS doesn’t work very well underground. It’s also likely to need good long range communications, and ditto.