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Chief of the Air Staff (United Kingdom)
Professional head of the Royal Air Force
Professional head of the Royal Air Force
| Field | Value |
|---|---|
| post | Chief |
| body | the Air Staff |
| flag | UK-Air-OF9-Flag.svg |
| flagcaption | Air Chief Marshal's command flag |
| image | Air Chief Marshal Harv Smyth 2025.jpg |
| incumbent | Air Chief Marshal Sir Harvey Smyth |
| incumbentsince | 29 August 2025 |
| department | Ministry of Defence |
| Royal Air Force | |
| style | Air Chief Marshal |
| member_of | Defence Council |
| Air Force Board | |
| Chiefs of Staff Committee | |
| reports_to | Chief of the Defence Staff |
| nominator | Secretary of State for Defence |
| appointer | Prime Minister |
| appointer_qualified | Subject to formal approval by the King-in-Council |
| termlength | 3 Years |
| formation | 3 January 1918 |
| first | Major General Sir Hugh Trenchard |
| abbreviation | CAS |
| deputy | Deputy Chief of the Air Staff |
| website |
Royal Air Force Air Force Board Chiefs of Staff Committee
Chief of the Air Staff (CAS) is the title of the professional head of the Royal Air Force, who is a member of both the Chiefs of Staff Committee and the Air Force Board. The post was created in 1918, with Major General Sir Hugh Trenchard as the first holder. The current and 32nd Chief of the Air Staff is Air Chief Marshal Sir Harvey Smyth, who succeeded Sir Richard Knighton on 29 August 2025.
Responsibilities
As of June 2023, the responsibilities were described as follows: As the RAF progressively adopts responsibility for Air Capability planning and management from MOD Head Office, CAS will be responsible for commissioning RAF equipment, materiel and other support requirements. As a Service Chief of Staff, he has the right of direct access to the Secretary of State and the Prime Minister. CAS chairs the Air Force Board Standing Committee, and is a member of the Defence Council, the Air Force Board, the Armed Forces Committee, the Chiefs' of Staff Committee and the Senior Appointments Committee. Current responsibilities for CAS include:
- Managing the AIR Top-Level Budget to deliver the RAF's Command Plan, in accordance with defence priorities and standing military tasks within the delegated funding;
- Ensuring the long-term health of the service, focusing on professional standards, ethos, welfare, career management and morale;
- Ensuring that the whole force, including civil servants and contractors, plays its part in delivering the required operational effects as components of a single team
- Advising on the development and maintenance of the optimum coherent set of requirements that UK defence requires;
- Providing CDS, MOD and the government with advice and recommendations on the operational employment of the RAF and contributing military experience and knowledge to assist in the development of defence policy.
History
The post of Chief of the Air Staff (CAS) was established in January 1918, just prior to the official formation of the Royal Air Force (RAF), and its first occupant was Major General Sir Hugh Trenchard. Following Trenchard's resignation in March 1918 after disagreements with the first air minister, Lord Rothermere, his rival Major General Sir Frederick Sykes was appointed. For political reasons Trenchard's resignation did not take effect until late April in order that he would be CAS when the RAF was formed. With Winston Churchill's post-war appointment as Secretary of State for War and Air, Sykes was moved sideways to head up the nascent Civil Aviation ministry and Trenchard returned as CAS. In the early 1920s, Trenchard had to fight to keep the RAF from being divided and absorbed back into the Royal Navy and the British Army. After Lord Trenchard retired in 1930 there were still suggestions that the RAF should be broken up, but Trenchard's foundations proved solid.
By the time the Second World War broke out in 1939, the then occupant of the post, Air Chief Marshal Sir Cyril Newall, had a service that had been undergoing the most rapid of expansions during the British rearmament programs of the late 1930s. Newall gave way in 1940 to Air Chief Marshal Sir Charles Portal, who led the service for the rest of the war. Portal was a tireless defender of the RAF and highly capable in administration and strategy. After the war the RAF was reoriented to perform the dual roles of defending the shrinking British Empire and possibly fighting against the Soviet Union in a Warsaw Pact verses NATO war over Germany and the United Kingdom. The Chiefs of the Air Staff of the day had to fight a constant battle to keep the British aircraft industry alive. In the end only minimal success was achieved, with only a rump aviation industrial base left by the 1970s.
The first eight Chiefs of the Air Staff were originally commissioned in the British Army, with four coming from the infantry, two from the artillery and one each from the cavalry and the engineers. Of these both Lord Trenchard and Sir John Salmond each held the post over two separate periods. By the early mid-1950s sufficient time had elapsed for officers originally commissioned in the British air services of the First World War to have risen through the ranks to RAF's senior post; Sir John Slessor had originally served in the Royal Flying Corps while Sir William Dickson was commissioned into the Royal Naval Air Service. In 1956 Sir Dermot Boyle became the first CAS to have originally been commissioned in the RAF.
Until 2023, every occupant of the post originally commissioned in the RAF was a qualified pilot. The first non-pilot to be appointed to the role is Sir Richard Knighton, who joined the RAF as an engineer, and who took up post in June 2023.
Appointees
The following list gives details of the chiefs of the air staff from 1918 to the present:
(Royal Scots Fusiliers) (15th Hussars) (Royal Scots Fusiliers) (King's Own (Royal Lancaster Regiment)) (Royal Artillery) (King's Own (Royal Lancaster Regiment)) (Royal Warwickshire Regiment and 2nd Gurkha Rifles) (Royal Engineers) (Dorset Regiment) reconnaissance (fast jet)
- The ranks and titles shown are the highest that the officer in question attained during his tour as Chief of the Air Staff. However, in the case where the officer was promoted on the day before he was posted or retired, then the lower rank is shown.
References
References
- [https://web.archive.org/web/20080312174932/http://www.mod.uk/NR/rdonlyres/8A6AC2D1-3CA3-4C12-82F8-5AD8C1800FFA/0/accounts.pdf Departmental Resource Accounts 2006-7] Ministry of Defence
- "Chief of the Air Staff".
- "Air Chief Marshal Sir Richard Knighton KCB FREng".
- (2004). "Sir John Salmond".
- (24 January 2013). "Meeting our makers: Britain's long industrial decline".
- (2004). "Sir Dermot Alexander Boyle".
- Haynes, Deborah. (29 March 2023). "RAF set to name non-pilot as chief for the first time in its history".
- . (31 March 2023). ["Air Marshal Sir Richard Knighton appointed new Chief of the Air Staff"](https://raf.mod.uk/news/articles/air-marshal-sir-richard-knighton-appointed-new-chief-of-the-air-staff/).
- "Air Marshal Sir Richard Knighton appointed new Chief of the Air Staff".
- Barrass, Malcolm. (9 October 2007). "Marshal of the RAF The Viscount Trenchard of Wolfeton". Air of Authority - A History of RAF Organisation.
- "Air Vice Marshal Sir Frederick Sykes". Air of Authority - A History of RAF Organisation.
- {{London Gazette. (20 May 1919)
- {{London Gazette. (31 December 1929)
- {{London Gazette. (31 March 1933)
- {{London Gazette. (2 May 1933)
- {{London Gazette. (23 May 1933)
- {{London Gazette. (3 September 1937)
- {{London Gazette. (12 November 1940)
- "Marshal of the Royal Air Force Lord Tedder". Air of Authority: A History of RAF Organisation.
- {{London Gazette. (30 December 1949)
- {{London Gazette. (30 December 1952)
- {{London Gazette. (27 December 1955)
- {{London Gazette. (20 March 1959)
- {{London Gazette. (15 February 1963)
- {{London Gazette. (31 March 1967)
- {{London Gazette. (5 April 1971)
- {{London Gazette. (1 April 1974)
- {{London Gazette. (10 August 1976)
- {{London Gazette. (1 August 1977)
- {{London Gazette. (1 November 1982)
- {{London Gazette. (7 October 1985)
- {{London Gazette. (28 November 1988)
- "Sir Michael Graydon". Debretts People of Today.
- "Sir Richard Johns". Debretts People of Today.
- ''[[Who's Who (UK). Who's Who]] 2010'', [[A & C Black]], 2010, {{ISBN. 978-1-4081-1414-8
- "Sir Jock Stirrup". NATO.
- {{London Gazette. (25 April 2006)
- "Air Rank Appointments List 07/08 dated 16 October 2008". Ministry of Defence.
- {{London Gazette. (23 July 2013)
- {{London Gazette. (26 July 2016)
- (3 December 2018). "A 'generation of innovators' has been appointed to run the military in a shake-up of the top ranks of the Army, Navy and RAF". The Daily Telegraph.
- Haynes, Deborah. (29 March 2023). "RAF set to name non-pilot as chief for the first time in its history".
- {{London Gazette. (9 September 2025)
- (2025-07-16). "Lurgan: Harv Smyth to become next head of Royal Air Force".
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