Know your assignments and do them. The best attack is a coordinated one when everyone is doing what needs to be done to accomplish the overall goal; safely get in and out after putting the fire out and removing all victims.
Just because a building is occupied does not make it inherently safe if it is on fire. The same is true for vacant buildings; just because it is vacant does not make inherently dangerous just because it is vacant. It also doesn’t mean it isn’t occupied.