Chief of the Air Staff
Ensign of the Royal Air Force (CAS Command Flag)
Incumbent Air Chief Marshal Sir Stephen Hillier since 11 July 2016
Ministry of Defence
Style	Air Chief Marshal
Abbreviation	CAS
Member of	Defence Council Air Force Board
Reports to	Chief of the Defence Staff
Nominator	Secretary of State for Defence
Appointer	Prime Minister Subject to formal approval by the Queen-in-Council[1]
Term length	No fixed length
Formation	3 January 1918
First holder	Major General Sir Hugh Trenchard
Deputy	Assistant Chief of the Air Staff
Website	Official website

The Chief of the Air Staff (CAS) is the professional head of the Royal Air Force and 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 incumbent. The current and 29th Chief of the Air Staff is Air Chief Marshal Sir Stephen Hillier, who succeeded Sir Andrew Pulford in July 2016.^[2][3]

History[edit]

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.^[4]

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. Postwar 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.^[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 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.^[6]

Chiefs of the Air Staff[edit]

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

№		Chief of the Air Staff	Took office	Left office	Time in office	Flying specialism or arm	Ref
1		Trenchard, HughMajor General Sir Hugh Trenchard (1873–1956)	3 January 1918	13 April 1918	7002100000000000000♠100 days	Infantry	[7]
2		Sykes, FrederickMajor General Sir Frederick Sykes (1877–1954)	13 April 1918	31 March 1919	7002352000000000000♠352 days	Cavalry	[8]
(1)		Trenchard, HughMarshal of the Royal Air Force Sir Hugh Trenchard (1873–1956)	31 March 1919	1 January 1930	7003392900000000000♠10 years, 276 days	Infantry	[9]
3		Salmond, JohnAir Chief Marshal Sir John Salmond (1881–1968)	1 January 1930	1 April 1933	7003118600000000000♠3 years, 90 days	Infantry	[10]
4		Salmond, GeoffreyAir Chief Marshal Sir Geoffrey Salmond (1878–1933)	1 April 1933	27 April 1933 †	7001260000000000000♠26 days	Artillery	[11]
-		Salmond, JohnMarshal of the Royal Air Force Sir John Salmond (1881–1968) Acting	28 April 1933	22 May 1933	7001240000000000000♠24 days	Infantry	[12]
5		Ellington, EdwardMarshal of the Royal Air Force Sir Edward Ellington (1877–1967)	22 May 1933	1 September 1937	7003156300000000000♠4 years, 102 days	Artillery	[13]
6		Newall, CyrilMarshal of the Royal Air Force Sir Cyril Newall (1886–1963)	1 September 1937	25 October 1940	7003115000000000000♠3 years, 54 days	Infantry	[14]
7		Portal, CharlesMarshal of the Royal Air Force The Lord Portal (1893–1971)	25 October 1940	1 January 1946	7003189400000000000♠5 years, 68 days	Engineers	[15]
8		Tedder, ArthurMarshal of the Royal Air Force Sir Arthur Tedder (1890–1967)	1 January 1946	1 January 1950	7003146100000000000♠4 years, 0 days	Infantry	[16]
9		Slessor, JohnMarshal of the Royal Air Force Sir John Slessor (1897–1979)	1 January 1950	1 January 1953	7003109600000000000♠3 years, 0 days	Fighters (biplanes)	[17]
10		Dickson, WilliamMarshal of the Royal Air Force Sir William Dickson (1898–1987)	1 January 1953	1 January 1956	7003109500000000000♠3 years, 0 days	Naval aviation (biplanes)	[18]
11		Boyle, DermotMarshal of the Royal Air Force Sir Dermot Boyle (1904–1993)	1 January 1956	1 January 1960	7003146100000000000♠4 years, 0 days	Fighters (biplanes)	[19]
12		Pike, ThomasMarshal of the Royal Air Force Sir Thomas Pike (1906–1983)	1 January 1960	1 September 1963	7003133900000000000♠3 years, 243 days	Fighters (biplanes)	[20]
13		Elworthy, CharlesAir Chief Marshal Sir Charles Elworthy (1911–1993)	1 September 1963	1 April 1967	7003130800000000000♠3 years, 212 days	Bombers (biplanes)	[21]
14		Grandy, JohnAir Chief Marshal Sir John Grandy (1913–2004)	1 April 1967	1 April 1971	7003146100000000000♠4 years, 0 days	Fighters (biplanes)	[22]
15		Spotswood, DenisAir Chief Marshal Sir Denis Spotswood (1916–2001)	1 April 1971	1 April 1974	7003109600000000000♠3 years, 0 days	Multirole (monoplane)	[23]
16		Humphrey, AndrewAir Chief Marshal Sir Andrew Humphrey (1921–1977)	1 April 1974	7 August 1976	7002890000000000000♠2 years, 159 days	Fighters (monoplane)	[24]
17		Cameron, NeilMarshal of the Royal Air Force Sir Neil Cameron (1920–1985)	7 August 1976	10 August 1977	7002337000000000000♠337 days	Fighters (monoplane)	[25]
18		Beetham, MichaelAir Chief Marshal Sir Michael Beetham (1923–2015)	10 August 1977	15 October 1982	7003189200000000000♠5 years, 66 days	Bombers (monoplane)	[26]
19		Williamson, KeithAir Chief Marshal Sir Keith Williamson (1928–2018)	15 October 1982	15 October 1985	7003109600000000000♠3 years, 0 days	Fighters (fast jet)	[27]
20		Craig, DavidAir Chief Marshal Sir David Craig (born 1929)	15 October 1985	14 November 1988	7003112600000000000♠3 years, 30 days	Fighters (fast jet)	[28]
21		Harding, PeterAir Chief Marshal Sir Peter Harding (born 1933)	14 November 1988	6 November 1992	7003145300000000000♠3 years, 358 days	Bombers (fast jet)	[29]
22		Graydon, MichaelAir Chief Marshal Sir Michael Graydon (born 1938)	6 November 1992	10 April 1997	7003161600000000000♠4 years, 155 days	Fighters (fast jet)	[30]
23		Johns, RichardAir Chief Marshal Sir Richard Johns (born 1939)	10 April 1997	21 April 2000	7003110700000000000♠3 years, 11 days	Fighters (fast jet)	[31]
24		Squire, PeterAir Chief Marshal Sir Peter Squire (1945–2018)	21 April 2000	1 August 2003	7003119700000000000♠3 years, 102 days	Fighters (fast jet)	[32]
25		Stirrup, JockAir Chief Marshal Sir Jock Stirrup (born 1949)	1 August 2003	13 April 2006	7002986000000000000♠2 years, 255 days	Ground attack / reconnaissance (fast jet)	[33]
26		Torpy, GlennAir Chief Marshal Sir Glenn Torpy (born 1953)	13 April 2006	31 July 2009	7003120500000000000♠3 years, 109 days	Ground attack (fast jet)	[34]
27		Dalton, StephenAir Chief Marshal Sir Stephen Dalton (born 1954)	31 July 2009	31 July 2013	7003146100000000000♠4 years, 0 days	Ground attack (fast jet)	[35]
28		Pulford, AndrewAir Chief Marshal Sir Andrew Pulford (born 1958)	31 July 2013	11 July 2016	7003107600000000000♠2 years, 346 days	Helicopters	[36]
29		Hillier, StephenAir Chief Marshal Sir Stephen Hillier	11 July 2016	Incumbent	7002843000000000000♠2 years, 113 days	Ground attack (fast jet)	[37]

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.

See also[edit]

Other service chiefs[edit]

• Chief of the Defence Staff (United Kingdom)


• First Sea Lord / Chief of the Naval Staff


• Chief of the General Staff (United Kingdom)


• 
  Chief of Air Force (Australia) (Between 1922 and 1997, the RAAF's senior officer was known as "Chief of the Air Staff".)
  


• Chief of the Air Staff (disambiguation)

Generally relevant[edit]

• CAS Air Power Workshop

References[edit]