First World War

An airfield was first established at Machrihanish towards the end of the First World War, 2 miles (3.2 km) west of Campbeltown. The site, known as Machrihanish Aerodrome and Mooring Out Station, extended to 65 acres (26 hectares) and comprised timber and canvas Bessonneau hangars and Armstrong huts. It was operated by the Royal Naval Air Service (RNAS) as a secondary station of the Luce Bay Airship Station, located near Stranraer, approximately 50 miles (80 km) to the south-east. Due to Machrihanish being relatively open and without the benefit of shelter from woodland, it is thought that the airfield saw little use by airships. On 1 April 1918, Machrihanish came under the control of the newly formed Royal Air Force (RAF), when the RNAS was merged with the army's Royal Flying Corps. The airfield became part of No. 25 (Operations) Group, with No. 272 Squadron forming on 25 July 1918, operating eighteen Airco DH.6s on anti-submarine patrols in the Firth of Clyde.

Along with its parent station at Luce Bay, Machrihanish closed towards the end of 1918, with the airfield transferring to civil aviation use. In the 1930s, it was used for scheduled flights to Islay, Renfrew and Belfast by Midland & Scottish Air Ferries.

Second World War

The airfield was requisitioned by the Fleet Air Arm (FAA) in 1940 and in April 1941 it became known as Royal Naval Air Station (RNAS) Machrihanish or HMS Landrail. During the same period, a new airfield was constructed by Bernard Sunley & Sons for the FAA to the north west of the existing airfield. The new airfield was opened on 15 June 1941 and was known as RNAS Strabane until the summer of 1941, when it took on the names RNAS Machrihanish and HMS Landrail. The original airfield became a satellite station of the new airfield and became known as HMS Landrail II.

Throughout the Second World War, Machrihanish was heavily used for training by a wide range of FAA and RAF aircraft and as a base for squadrons disembarked from aircraft carriers. The airfield was also used for operational anti-submarine patrols and convoy escort duties, becoming one of the top three busiest stations in the UK. At the end of the war activity decreased, with the station closing on 16 April 1946. At the same time, HMS Landrail II closed, with the land returned to agricultural use.

Cold War

After closure, Machrihanish was retained by the FAA on a care and maintenance basis, until 1 December 1951 when it was reopened as a satellite of HMS Sanderling (now Glasgow Airport). It was used for a short period for training FAA pilots in preparation for their involvement in the Korean War aboard the aircraft carrier HMS Indomitable, before again being reduced to care and maintenance status on 30 September 1952. The airfield was used by the Fleet Requirements Unit in 1958.

Redevelopment for US and NATO use

In April 1959, it was announced that the airfield would be upgraded in order to support United States and NATO operations in the Clyde area and wider Atlantic. Paid for by NATO, the station underwent extensive redevelopment in the early 1960s, with land belonging to seven farms and six small holdings being acquired for the purpose. Its four existing runways were replaced by a new 3,049 m (10,003 ft) runway to allow Avro Vulcan bombers and other large aircraft to use the airfield.

Control of Machrihanish was transferred from the Admiralty to the Air Ministry on 27 May 1963. In June 1964, Machrihanish was opened as an RAF station under No. 18 Group, part of RAF Coastal Command. Although not an operational station and with no flying squadrons based there, it was assigned to NATO's Supreme Allied Commander Europe, for use as a forward operating base in the event of war with the Soviet Union.

US Navy use

The mid-1960s saw the airfield being made available for use to the US Navy. Although nominally still an RAF station, it came under the command of the US Navy's Commander in Chief, Atlantic Command. The first U.S. naval personnel arrived in mid-1967 and were from the Mobile Mine Assembly Unit, previously based at RAF Mildenhall in Suffolk. They were later joined by an Explosives Ordnance Disposal (EOD) Group detachment, part of the US Atlantic Fleet. On 7 March 1968, the Naval Aviation Weapons Facility Machrihanish (NAWF) was opened, its role being to 'receive, store, maintain, issue and tranship classified weapons in support of the US Navy and NATO operations'. The NAWF comprised a fenced compound located on the north-west side of the airfield, within which were three rows of flat roofed concrete sheds (known as igloos) about 161m long. The rows were sub-divided into compartments featuring air-tight doors and were designed for the storage of nuclear depth charges and atomic demolition munitions, for use in anti-submarine warfare.

A detachment of the US Marine Corps arrived in 1974, with the role of providing nuclear weapons security, which until then had been provided by USN personnel.

The early 1980s saw the arrival of Naval Special Warfare Unit 2 and Naval Special Warfare Task Group Europe, both components of the US Navy SEALs Naval Special Warfare Group 2.