Abstract: The invention relates to an observation and/or firing system intended for an observer housed in a vehicle 1, wherein the vehicle 1 is equipped with elevation means 3 for the observation means 4, said means 4 being supported by a supporting structure, said elevation means 3 being equipped with an interface 19 to provide a power supply and communications with the observation means 4. The observation means 4 are constituted by a cupola adapted to the supporting structure and able to be removed from it. The cupola 4 is a component of the usable supporting structure which can be a vehicle.