To be honest, I'd really rather not get lost in the dark abyss/void of Heavy equipment. I've seen too many guys get their dump/back hoe quals and that's all they'll ever do for the rest of their careers despite their best efforts. No more courses/tasks once you get thrown into Heavy.
So, with the exception of EOD (which as a reservist the chances of getting the course is nil), engineers can only get courses that make us only slightly more than glorified sand baggers?