Hello. I know that missions have certain vehicle requirements, available on the "Possible missions" page, but my question is for how long those vehicles need to stay on the scene. I don't know if this is a bug, but I noticed that, for example, for the mission "Manhole Fire", as soon as the Battalion Chief unit arrives to the place, it can immediately be dispatched to another mission, as the previous one will still be completed. It doesn't make much sense to me, since it would be logical that the required units would have to stay on the area until completion.
