Firefighters are primarily involved with protecting structures, but they also work at airports on crash and rescue crews, at chemical plants, by waterfronts, and in forests and wildland areas. In forests, air patrols locate fires and report their findings to headquarters by telephone or radio. Fire rangers patrol areas of the forest to locate and report fires and hazardous conditions and to ensure that travelers and campers are complying with fire regulations. When fires break out, firefighters use hand tools and water hoses to battle the blaze. Some specialized firefighters parachute from airplanes when necessary to reach inaccessible areas.
Most fire departments have a fire prevention division which is usually headed by a fire marshall.
Fire inspectors are specially trained to conduct inspections of structures to prevent fires and to ensure fire code compliance. These firefighters may also check and approve plans for new buildings, working with developers and planners in that process. Fire prevention personnel often speak on these subjects before public assemblies and civic organizations. Some firefighters become fire investigators, who determine the origin and cause of fires. They collect evidence, interview witnesses, and prepare reports on fires where there may be arson or criminal negligence.