My alliance are asking if we could get tankers, foam trucks, helicopters, and Swat. Also they would like to see a supervisor.
Admin of Central Ohio J Fire district
If my testing serves me well, the Utility is the same as the Heavy Rescue Unit. At least that's how it seems to play out in my game. I don't have 11 stations yet, but the HAZMAT unit is needed at 11 stations, so it's good to train your guys early (aka fire academy for 500k), and then when you have 10 stations put in the hazmat unit to prepare for the 11th station. If anyone else has seen anything different please comment.
I currently have 8 FD's, 3 EMS, 4, 2 Hospitals, and 1 Fire Academy, which I am using to train 10 guys from each station. After that once the hazmat unit is purchased, I will assign those personnel only to the hazmat truck, so they can rotate out.