Aden is a city, and since 2015, the temporary capital of Yemen, near the eastern approach to the Red Sea, some 170 km (110 mi) east of the strait Bab-el-Mandeb. Its population is approximately 800,000 people. Aden's natural harbour lies in the crater of a dormant volcano, which now forms a peninsula joined to the mainland by a low isthmus. This harbour, Front Bay, was first used by the ancient Kingdom of Awsan between the 5th and 7th centuries BC. The modern harbour is on the other side of the peninsula. Aden gives its name to the Gulf of Aden.
The 1966 Defence White Paper was a major review of the United Kingdom's defence policy initiated by the Labour government under Prime Minister Harold Wilson. The review was led by the Secretary of State for Defence, Denis Healey. The document was centred on the need to support NATO in Europe and made the commitment that the UK, "would not undertake major operations of war except in co-operation with allies." The 1966 announcements undertook to retain the UK presence in Singapore and Malaysia.
Number 42 Squadron was a squadron of the Royal Air Force. It served during the First World War as an army co-operation squadron and during the Second World War in various roles. Between 1992 and 2010, it was the Operational Conversion Unit (OCU) for the Hawker Siddeley Nimrod MR.2, based at RAF Kinloss, Moray, until the Nimrod MR.2's retirement in March 2010. No. 42 Squadron disbanded on 26 May 2011.
Tengah Air Base is a military airbase of the Republic of Singapore Air Force located in the Western Water Catchment, in the western part of Singapore. The station is the most important airfield of the RSAF as it houses the majority of the RSAF's fixed-wing frontline squadrons, home to all of RSAF's Airborne early warning and control (AEWC) assets, most of the F-16C/D Fighting Falcons and many UAVs. The airfield goes by the motto of Always Vigilant, which is supported by its main motif, a black knight chess piece symbolising the aircraft's operational readiness in Tengah. The sword represents war's heraldic sword of destruction, while the state is depicted by the castle.
The State of Aden was a state constituted in Aden within the Federation of South Arabia. Following its establishment on 18 January 1963, Sir Charles Johnston stepped down as the last Governor of Aden.
The Bristol Type 192 Belvedere is a British twin-engine, tandem rotor military helicopter built by the Bristol Aeroplane Company. It was designed by Raoul Hafner for a variety of transport roles including troop transport, supply dropping and casualty evacuation. It was operated by the Royal Air Force (RAF) from 1961 to 1969. The Belvedere was Britain's only tandem rotor helicopter to enter production, and one of the few not built by Boeing or Piasecki.
No. 37 Squadron was a Royal Air Force squadron of the First and Second World Wars.
The Aden Emergency, also known as the Radfan Uprising, was an armed insurgency by NLF and FLOSY during the Cold War against the Federation of South Arabia, a protectorate of the United Kingdom, which now forms part of Yemen.
The Vickers Valetta is a twin-engine military transport aircraft developed and produced by the British manufacturing company Vickers-Armstrongs Ltd. Developed from the Vickers VC.1 Viking compact civil airliner, it was an all-metal mid-wing monoplane with a tailwheel undercarriage.
The Italian invasion of British Somaliland was part of the East African campaign (1940–1941) in which Italian, Eritrean and Somali forces of Fascist Italy entered British Somaliland and defeated its combined garrison of British, Commonwealth and colonial forces supported by Somali irregulars. The Italian victory was based on mobility and speed but was hampered by the terrain, rainy weather and British resistance.
No. 105 Squadron was a flying squadron of the Royal Air Force, active for three periods between 1917 and 1969. It was originally established during the First World War as a squadron of the Royal Flying Corps and disbanded after the war. Reactivated shortly before the Second World War, it was inactive again after the conflict. During its second existence it was a bomber unit and had the distinction to be the first to operate the de Havilland Mosquito light bomber. During the 1960s it was reactivated again for six years to provide transport support for the British Army in the Aden Protectorate and the Far East.
Royal Air Force Khormaksar or more simply RAF Khormaksar was a Royal Air Force station in Aden, Yemen. Its motto was "Into the Remote Places". During the 1960s, it was the base for nine squadrons and became the RAF's busiest-ever station as well as the biggest staging post for the RAF between the United Kingdom and Singapore.
British Forces Aden was the name given to the British Armed Forces stationed in the Aden Protectorate during part of the 20th century. Their purpose was to preserve the security of the Protectorate from both internal threats and external aggression.
The National Liberation Front or NLF was a Marxist paramilitary organization and a political party operating in the Federation of South Arabia, during the Aden Emergency. During the North Yemen Civil War, fighting spilled over into South Yemen as the British attempted to establish an autonomous colony known as the Federation of South Arabia. Following the exit of the British armed forces, the NLF seized power from its rival, the Arab nationalist Front for the Liberation of Occupied South Yemen (FLOSY). In the aftermath of the Emergency, the NLF reorganized itself into the Yemeni Socialist Party and established a single-party Marxist-Leninist government, known as the People's Democratic Republic of Yemen.
The Radfan Campaign was a series of British military actions during the Aden Emergency in January–May 1964. It took place in the mountainous Radfan region near the border with Yemen. Local tribesmen connected with the NLF began raiding the road connecting with Aden with the town of Dhala.
No. 90 (Composite) Wing was a Royal Australian Air Force (RAAF) wing that operated during the early years of the Malayan Emergency. Its purpose was to serve as an umbrella organisation for the RAAF units deployed in the conflict, No. 1 (Bomber) Squadron, flying Avro Lincolns, and No. 38 (Transport) Squadron, flying Douglas C-47 Dakotas. The wing was established in July 1950 and headquartered at Changi, on the east coast of Singapore. No. 1 Squadron operated from Tengah, in Singapore's west. No. 38 Squadron was based at Changi and, from April 1951 to February 1952, at Kuala Lumpur in central Malaya. The Lincolns generally conducted area bombing missions, as well as precision strikes, to harass communist insurgents. The Dakotas were tasked with airlifting cargo, VIPs, troops and casualties, as well as courier flights and supply drops. Following No. 38 Squadron's departure in December 1952, No. 90 Wing was disbanded, leaving No. 1 Squadron to carry on as the sole RAAF unit in the Malayan air campaign until its withdrawal to Australia in July 1958.
The Battle of the Crater or Operation Stirling Castle was an encounter during the Aden Emergency. Following the ambush of British troops by the Arab Armed Police the Crater district in Aden was abandoned by British troops. The British decided to enter the Crater and retrieve the bodies of British soldiers.
The Arab Police mutiny was an incident during the Aden Emergency where Arab soldiers and police mutinied against British troops. While the mutiny itself was localized and quickly suppressed, it undermined the South Arabian Federation which had been organized by Britain in 1959 as an intended successor to direct colonial rule.
The High Commissioner Attack was an incident which saw the beginning of the Aden Emergency. Arab nationalists of the NLF made a grenade attack against the British High Commissioner, Sir Kennedy Trevaskis, killing one person and injuring 50.
Air Commodore Charles Henry Clarke, was a British Royal Air Force officer. Having served in Bomber Command in the Second World War, he was shot down and interned at Stalag Luft III—this was The Great Escape camp and he acted as a watcher but was not involved in the escape itself. He remained in the RAF after the war, commanded RAF Stafford, served in Palestine, Aden and Malta, before retiring in 1978. He later campaigned for a memorial to Bomber Command: one was finally erected in 2012 in London.
United Kingdom 
National Liberation Front