 As a general rule the RAF personnel cover runways or airfields with particular expertise in defusing aircraft munitions, with the civilians covering domestic sites, but there were cross overs and both services could be called to airfield and domestic situations.Both RAF and defence personnel can serve abroad both in peacetime and at war.Several state properties, including royal residences and the Palace of Westminster, are protected by their own fire services in the interests of protecting sites of heritage and royal importance.