The Royal Brunei Armed Forces (RBAF), also natively known as Angkatan Bersenjata Diraja Brunei (ABDB), is the collective term for all of the military forces or service branches of the sultanate of Brunei Darussalam. The RBAF consists of three primary military branches; the Royal Brunei Land Force (RBLF / TDDB), the Royal Brunei Navy (RBN / TLDB), and the Royal Brunei Air Force (RBAirF / TUDB).

The supreme commander of the RBAF is held by the Sultan of Brunei, Sultan Hassanal Bolkiah, holding the rank of field marshal. Its professional head is known as the Commander of the Royal Brunei Armed Forces, with the rank of major general, Haszaimi Bol Hassan. The RBAF are controlled and managed by the Ministry of Defence (MINDEF), from their headquarters within Bolkiah Garrison.

The forerunner to the RBAF, the Brunei Malay Regiment, was formed on 31 May 1961, with British military support, and has continued to include officers on loan from the British military. 31 May is annually marked as Armed Forces Day.

Royal Brunei Land Force (Tentera Darat Diraja Brunei)
https://en.wikipedia.org/wiki/Royal_Brunei_Land_Force
The Royal Brunei Land Force (RBLF), natively known as Tentera Darat Diraja Brunei (TDDB) is the land component of the Royal Brunei Armed Forces (RBAF) or Angkatan Bersenjata Diraja Brunei (ABDB). The RBLF has responsibility for maintaining the territorial defence of Brunei Darussalam, both from attack from outsiders, and by assisting the Royal Brunei Police Force (RBPF) in maintaining law and order. The annual anniversary ceremony of RBLF's inception was place on 4 November every year.

Royal Brunei Air Force (Tentera Udara Diraja Brunei)
https://en.wikipedia.org/wiki/Royal_Brunei_Air_Force
The Royal Brunei Air Force (RBAirF), natively known as the Tentera Udara Diraja Brunei (TUDB), is the air force of the sultanate of Brunei. It is headquartered and mainly based at the Royal Brunei Air Force Base, Rimba, opposite the Brunei International Airport (BIA). Its role is to defend the national airspace and to provide air policing and surveillance of its land and maritime borders. As of 2024, it operates twenty-two manned aircraft and five unmanned aerial vehicles (UAV).

The RBAirF was formed as an independent air force on 1 October 1991. It was originally created in 1965 as the Air Wing of the Royal Brunei Malay Regiment (Askar Melayu Diraja Brunei; AMDB), the forerunner of today's Royal Brunei Armed Forces (RBAF). The Air Wing had operated helicopters (the Bell 205) since 1966. The annual anniversary ceremony of RBAirF's inception was place on 24 June every year.

Royal Brunei Navy (Tentera Laut Diraja)
https://en.wikipedia.org/wiki/Royal_Brunei_Navy
The Royal Brunei Navy (RBN), natively known as Tentera Laut Diraja Brunei (TLDB) is the naval defence force of Brunei. It is a small but relatively well-equipped military force whose main responsibility is to conduct search and rescue missions, and to deter and defend the Brunei waters against attack mounted by seaborne forces.

The forerunner of the RBN was established on 14 June 1965, the second unit created after the formation of the Royal Brunei Armed Forces (RBAF). The RBN is based and headquartered at Muara Naval Base, 4 kilometres (2 miles) from Muara Town, with the majority of the enlisted sailors being Malays. Since 1977, the RBN has been equipped with missile gun boats and other coastal patrol craft. All the ships names are prefixed KDB, as in Kapal Diraja Brunei (Royal Brunei Ship in Malay). Captain Haji Mohamad Sarif Pudin has been acting commander of the RBN since 30 December 2022, succeeding First Admiral Pengiran Dato Seri Pahlawan Norazmi who was appointed the RBN 12th commander on 13 March 2015. The annual anniversary ceremony of RBN's inception was place on 14 June every year.