French firefighters are called Sapeurs-Pompiers, and reflecting the rural nature of much of the country (wide areas with low density of population), the Volunteer Fire brigade (SPV, "sapeur-pompier volontaire"), with over 190,000 firefighters is the largest firefighting force in France. In addition to being called out from work to attend an incident, they may be on standby at firestations outside their working hours; the intervention and attending hours are paid by the session. The volunteer fire brigade is also a way to promote the culture of civil defense and of solidarity amongst the population. The Professional Fire Brigade (SPP, "sapeur-pompier professionnel") numbers over 30,000 firefighters, employed by the départements and working in shifts. In some towns there is a mixture of professionals and volunteers, in others only one or the other.