The Royal Brunei Air Force (RBAirF) or Angkatan Tentera Udara Diraja Brunei (ATUDB) as it is known by its Malay name, is the air force of the sultanate of Brunei. It is mainly based at the Rimba Air Base within the Brunei International Airport. The role of the Royal Brunei Air Force is to defend the national airspace and to provide air surveillance of the land and maritime borders.