I'm not involved in SAR
yet, but I am a climbing instructor and an avid backpacker, and I love my Danners for rough terrain, technical mountaineering exluded (I've got Asolos for that).
I'm on my 4th pair of Danners in about 6 years, and they're about to be replaced with another pair. I've now gone through a pair of Arcadias (full leather), Ft. Lewis' (also full leather), Marine Hot Weathers and Desert Arcadias (both rough out leather and nylon). The last two were not designed for the wetness of the PNW, but they faired well enough.
Unfortunately for me I'm hard on all boots due to the shape of my heel. I'm used to replacing my boots more frequently than others due to the heel cup wearing out and the plastic section causing me blisters, but it usually takes about a year of daily wear for that issue to arise and it's almost a non-issue to me at this point.
If you want a boot for scrambling you obviously need a good combination of durability, light weight, grip and ankle support, and most of the danner military boots will provide that. Try to steer clear of the desert tread patterns as they're best suited for sand and dirt and don't provide enough grip on slick rocks, but the other boots will do just fine. My leather Arcadias did well in the wet stuff until they wore out, my only issue with them being their relatively heavy weight, which yours address with nylon uppers.
I'm looking into getting a pair of their new
Combat Hikers, which are a lot more rugged than the boots I've had in the past, and I'm excited to see how they do.