Chief of the Air Staff
Air Chief Marshal's command flag
Incumbent Air Chief MarshalHarvey Smyth since 29 August 2025
Ministry of Defence Royal Air Force
Style	Air Chief Marshal
Abbreviation	CAS
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 Subject to formal approval by theKing-in-Council[1]
Term length	3 Years
Formation	3 January 1918
First holder	Major General SirHugh Trenchard
Deputy	Deputy Chief of the Air Staff
Website	Official website

Chief of the Air Staff (CAS) is the title of the professional head of theRoyal Air Force, who is a member of both theChiefs of Staff Committee and theAir Force Board. The post was created in 1918, with Major General SirHugh Trenchard as the first holder. The current and 32nd Chief of the Air Staff is Air Chief MarshalHarvey Smyth, who succeeded SirRichard Knighton on 29 August 2025.^[2]

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.^[3]

The post of Chief of the Air Staff (CAS) was established in January 1918, just prior to the official formation of theRoyal Air Force (RAF), and its first occupant was Major General SirHugh Trenchard. Following Trenchard's resignation in March 1918 after disagreements with the first air minister,Lord Rothermere, his rival Major General SirFrederick 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. WithWinston Churchill's post-war appointment asSecretary of State for War andAir, 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 theRoyal Navy and theBritish Army. After Lord Trenchard retired in 1930 there were still suggestions that the RAF should be broken up, but Trenchard's foundations proved solid.^[4]

By the time theSecond World War broke out in 1939, the then occupant of the post, Air Chief Marshal SirCyril 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 SirCharles 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. Postwar the RAF was reoriented to perform the dual roles of defending the shrinkingBritish Empire and possibly fighting against theSoviet Union in aWarsaw Pact versesNATO 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.^[5]

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 SirJohn 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; SirJohn Slessor had originally served in theRoyal Flying Corps while SirWilliam Dickson was commissioned into theRoyal Naval Air Service. In 1956 SirDermot Boyle became the first CAS to have originally been commissioned in the RAF.^[6]

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 SirRichard Knighton, who joined the RAF as an engineer,^[7][8] and who took up post in June 2023.^[9]

The following list gives details of the chiefs of the air staff from 1918 to the present:^[1]

No.	Portrait	Name	Took office	Left office	Time in office	Flying specialism or arm	Ref.
1		Trenchard, HughMajor-General SirHugh Trenchard (1873–1956)	3 January 1918	13 April 1918	100 days	Infantry (Royal Scots Fusiliers)	[10]
2		Sykes, FrederickMajor-General SirFrederick Sykes (1877–1954)	13 April 1918	31 March 1919	352 days	Cavalry (15th Hussars)	[11]
(1)		Trenchard, HughMarshal of the Royal Air Force SirHugh Trenchard (1873–1956)	31 March 1919	1 January 1930	10 years, 276 days	Infantry (Royal Scots Fusiliers)	[12]
3		Salmond, JohnAir Chief Marshal SirJohn Salmond (1881–1968)	1 January 1930	1 April 1933	3 years, 90 days	Infantry (King's Own (Royal Lancaster Regiment))	[13]
4		Salmond, GeoffreyAir Chief Marshal SirGeoffrey Salmond (1878–1933)	1 April 1933	27 April 1933 †	26 days	Artillery (Royal Artillery)	[14]
-		Salmond, JohnMarshal of the Royal Air Force SirJohn Salmond (1881–1968) Acting	28 April 1933	22 May 1933	24 days	Infantry (King's Own (Royal Lancaster Regiment))	[15]
5		Ellington, EdwardMarshal of the Royal Air Force SirEdward Ellington (1877–1967)	22 May 1933	1 September 1937	4 years, 102 days	Artillery (Royal Field Artillery)	[16]
6		Newall, CyrilMarshal of the Royal Air Force SirCyril Newall (1886–1963)	1 September 1937	25 October 1940	3 years, 54 days	Infantry (Royal Warwickshire Regiment and2nd Gurkha Rifles)	[17]
7		Portal, CharlesMarshal of the Royal Air Force Charles Portal, 1st Viscount Portal of Hungerford (1893–1971)	25 October 1940	1 January 1946	5 years, 68 days	Engineers (Royal Engineers)	[18]
8		Tedder, ArthurMarshal of the Royal Air Force Arthur Tedder, 1st Baron Tedder (1890–1967)	1 January 1946	1 January 1950	4 years, 0 days	Infantry (Dorset Regiment)	[19]
9		Slessor, JohnMarshal of the Royal Air Force John Slessor (1897–1979)	1 January 1950	1 January 1953	3 years, 0 days	Fighters (biplanes)	[20]
10		Dickson, WilliamMarshal of the Royal Air Force SirWilliam Dickson (1898–1987)	1 January 1953	1 January 1956	3 years, 0 days	Naval aviation (biplanes)	[21]
11		Boyle, DermotMarshal of the Royal Air Force SirDermot Boyle (1904–1993)	1 January 1956	1 January 1960	4 years, 0 days	Fighters (biplanes)	[22]
12		Pike, ThomasMarshal of the Royal Air Force SirThomas Pike (1906–1983)	1 January 1960	1 September 1963	3 years, 243 days	Fighters (biplanes)	[23]
13		Elworthy, CharlesAir Chief Marshal SirCharles Elworthy (1911–1993)	1 September 1963	1 April 1967	3 years, 212 days	Bombers (biplanes)	[24]
14		Grandy, JohnAir Chief Marshal SirJohn Grandy (1913–2004)	1 April 1967	1 April 1971	4 years, 0 days	Fighters (biplanes)	[25]
15		Spotswood, DenisAir Chief Marshal SirDenis Spotswood (1916–2001)	1 April 1971	1 April 1974	3 years, 0 days	Multirole (monoplane)	[26]
16		Humphrey, AndrewAir Chief Marshal SirAndrew Humphrey (1921–1977)	1 April 1974	7 August 1976	2 years, 159 days	Fighters (monoplane)	[27]
17		Cameron, NeilMarshal of the Royal Air Force SirNeil Cameron (1920–1985)	7 August 1976	10 August 1977	337 days	Fighters (monoplane)	[28]
18		Beetham, MichaelAir Chief Marshal SirMichael Beetham (1923–2015)	10 August 1977	15 October 1982	5 years, 66 days	Bombers (monoplane)	[29]
19		Williamson, KeithAir Chief Marshal SirKeith Williamson (1928–2018)	15 October 1982	15 October 1985	3 years, 0 days	Fighters (fast jet)	[30]
20		Craig, DavidAir Chief Marshal SirDavid Craig (born 1929)	15 October 1985	14 November 1988	3 years, 30 days	Fighters (fast jet)	[31]
21		Harding, PeterAir Chief Marshal SirPeter Harding (1933–2021)	14 November 1988	6 November 1992	3 years, 358 days	Bombers (fast jet)	[32]
22		Graydon, MichaelAir Chief Marshal SirMichael Graydon (born 1938)	6 November 1992	10 April 1997	4 years, 155 days	Fighters (fast jet)	[33]
23		Johns, RichardAir Chief Marshal SirRichard Johns (born 1939)	10 April 1997	21 April 2000	3 years, 11 days	Fighters (fast jet)	[34]
24		Squire, PeterAir Chief Marshal SirPeter Squire (1945–2018)	21 April 2000	1 August 2003	3 years, 102 days	Fighters (fast jet)	[35]
25		Stirrup, JockAir Chief Marshal SirJock Stirrup (born 1949)	1 August 2003	13 April 2006	2 years, 255 days	Ground attack/ reconnaissance (fast jet)	[36]
26		Torpy, GlennAir Chief Marshal SirGlenn Torpy (born 1953)	13 April 2006	31 July 2009	3 years, 109 days	Ground attack (fast jet)	[37]
27		Dalton, StephenAir Chief Marshal SirStephen Dalton (born 1954)	31 July 2009	31 July 2013	4 years, 0 days	Ground attack (fast jet)	[38]
28		Pulford, AndrewAir Chief Marshal SirAndrew Pulford (born 1958)	31 July 2013	11 July 2016	2 years, 346 days	Helicopters	[39]
29		Hillier, StephenAir Chief Marshal SirStephen Hillier (born 1962)	11 July 2016	26 July 2019	3 years, 15 days	Ground attack (fast jet)	[40]
30		Wigston, MichaelAir Chief Marshal SirMichael Wigston (born 1968)	26 July 2019	2 June 2023	3 years, 311 days	Ground attack (fast jet)	[41]
31		Knighton, RichardAir Chief Marshal SirRichard Knighton (born 1969)	2 June 2023	29 August 2025	2 years, 88 days	Engineer (aeronautical)	[42]
32		Smyth, HarveyAir Chief Marshal Harvey Smyth	29 August 2025	Incumbent	85 days	Ground attack (fast jet)	[43][44]

1. ^ 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.

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