"Incidences of natural ground cover fires nearer to urban areas have become more frequent in recent years. The wildland-urban interface is the area where development meets or intermingles with undeveloped wildland. In this environment fire can move between structural and vegetation fuels, increasing the likelihood that wildfires will threaten structures and people. Fire departments not traditionally responsible for Wildland firefighting are increasingly responding to calls for assistance at Wildland incidents, therefore it is necessary for urban fire departments to become better educated and trained to perform safely and effectively in these environments."
InterAgency Board: https://www.interagencyboard.org/