First I will warn that the boot I am about to suggest is $348, and many will balk at spending that much. But hey, they're your feet, and it's your choice.
http://www.thefirestore.com/store/product.cfm?pID=6427
These boots are suitable to wear in just about any kind of situation an FD-based EMT/paramedic would ever get into, except for actual structural firefighting. The EMT who is
not working as part of a fire department probably won't need most of that, of course, but the bloodborne-pathogen resistance and liquid-splash protection will probably be nice features for those people as well.
One of the advertising points Globe uses for these is, "Feels like you are wearing an athletic sneaker." My first impression after getting these boots was that this claim was wishful thinking. However, after a few days, I came to realize that my initial impression was based more on the weight and coverage of these boots, and not on comfort. What I mean is that naturally, these boots weigh more than your average sneaker, so that automatically makes them feel different from sneakers. But in terms of comfort alone, I've come to realize that yeah, Globe really is pretty spot-on with that claim. These are the most comfortable boots I've ever worn.
My only complaint is that the tongues are frickin' huge (wide). I like wearing boots fairly snug, and it can be somewhat tricky to tuck in all that extra tongue in such a way that it zips up tight. Actually, that reminds me of another complaint, which is that I would have preferred a side-zip design instead of lace-in zippers.
I've only had them for several weeks, so I cannot say to much about their durability. However, at this point, I am still strongly recommending them for anyone willing to invest in foot protection and comfort.