The Royal Brunei Air Force (RBAirF) (Malay: Tentera Udara Diraja Brunei, abbreviation TUDB) is the air force of the sultanate of Brunei. It is mainly based at the Rimba Air Force 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. The Royal Brunei Air Force was formed on 1 October 1991 from the Air Wing of the Royal Brunei Armed Forces. The Air Wing of the Royal Brunei Armed Forces had operated helicopters (the Bell 205) since 1966.