Because in the past they didn't have any fire vans.
The plural of fireman is firemen. If you want to use inclusive language, then you can say firefighter and firefighters.
The horses have all been brushed. She brushed past me without a word.
Cambria
The past of drag is dragged. Example: The firefighters dragged the smoldering mattress out of the house.
The personal pronoun that takes the place of the plural noun 'firefighters' is they as a subject and them as an object.example: The firefighters use this facility for training. When they damage it, a local contractor repairs it for them at no charge.
They don't have to be beige/khaki. Many departments use black, and some even use red!
past: horses and carraiges present: engines and electricity.
firefighters use water because when water touches something it cools down
water is the most practical thing to use
Fire Hydrant maintenance/removal is normally the responsibility of the City or the works/utilities department, as it is a part of the municipal water system. Firefighters are generally not involved with anything past the normal operation of a fire hydrant.
There is no standard collective noun for firefighters, in which case a noun that suits the situation can be used; for example a crew of firefighters, a squadron of firefighters, a team of firefighters, etc.
It's Carbon Dioxide (CO2)