Secretary of State for Defence

Defence SecretaryMinister of DefenceSec. of StateDefenceDefence MinisterSpokesperson for DefenceArmed Forces MinisterBritish Defence SecretaryDefence SecretariesUK Defence Secretary
Her Majesty's Principal Secretary of State for Defence (Defence Secretary) is a senior official within Her Majesty's Government and head of the Ministry of Defence (MoD).wikipedia
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Ben Wallace (politician)

Ben WallaceBen '''WallaceBen Wallace (UK politician)
The office is a British Cabinet–level position, and has been held by Ben Wallace since July 2019.
Robert Ben Lobban Wallace (born 15 May 1970) is a British politician serving as Secretary of State for Defence since 24 July 2019.

First Lord of the Admiralty

First Lords of the AdmiraltyList of the First Lords of the AdmiraltyFirst Lord
It replaced the positions of First Lord of the Admiralty, Secretary of State for War, and Secretary of State for Air, as the Admiralty, War Office and Air Ministry were merged into the Ministry of Defence (the Secretary of State for War had already ceased to be a cabinet position in 1946, with the creation of the cabinet-level Minister of Defence). When the Second World War broke out, the new Prime Minister Neville Chamberlain formed a small War Cabinet and it was expected that Chatfield would serve as a spokesperson for the three service ministers, the Secretary of State for War, the First Lord of the Admiralty and the Secretary of State for Air; however, political considerations resulted in all three posts being included in the Cabinet, and Chatfield's role proved increasingly redundant. The former Cabinet positions of First Lord of the Admiralty, Secretary of State for War and Secretary of State for Air (responsible for the Royal Navy, British Army and Royal Air Force respectively) were incorporated into it and the offices of the Admiralty, War Office and the Air Ministry were abolished and their functions transferred to an expanded Ministry of Defence.
In 1946, the three posts of Secretary of State for War, First Lord of the Admiralty, and Secretary of State for Air became formally subordinated to that of Minister of Defence, which had itself been created in 1940 for the co-ordination of defence and security issues.

Secretary of State for Air

President of the Air CouncilAirPresident of the Air Board
It replaced the positions of First Lord of the Admiralty, Secretary of State for War, and Secretary of State for Air, as the Admiralty, War Office and Air Ministry were merged into the Ministry of Defence (the Secretary of State for War had already ceased to be a cabinet position in 1946, with the creation of the cabinet-level Minister of Defence). When the Second World War broke out, the new Prime Minister Neville Chamberlain formed a small War Cabinet and it was expected that Chatfield would serve as a spokesperson for the three service ministers, the Secretary of State for War, the First Lord of the Admiralty and the Secretary of State for Air; however, political considerations resulted in all three posts being included in the Cabinet, and Chatfield's role proved increasingly redundant. The former Cabinet positions of First Lord of the Admiralty, Secretary of State for War and Secretary of State for Air (responsible for the Royal Navy, British Army and Royal Air Force respectively) were incorporated into it and the offices of the Admiralty, War Office and the Air Ministry were abolished and their functions transferred to an expanded Ministry of Defence.
In 1946, the three posts of Secretary of State for War, First Lord of the Admiralty, and Secretary of State for Air became formally subordinated to that of Minister of Defence, which had itself been created in 1940 for the co-ordination of defence and security issues.

Secretary of State for War

War SecretarySecretaries of State for WarWar Minister
It replaced the positions of First Lord of the Admiralty, Secretary of State for War, and Secretary of State for Air, as the Admiralty, War Office and Air Ministry were merged into the Ministry of Defence (the Secretary of State for War had already ceased to be a cabinet position in 1946, with the creation of the cabinet-level Minister of Defence). When the Second World War broke out, the new Prime Minister Neville Chamberlain formed a small War Cabinet and it was expected that Chatfield would serve as a spokesperson for the three service ministers, the Secretary of State for War, the First Lord of the Admiralty and the Secretary of State for Air; however, political considerations resulted in all three posts being included in the Cabinet, and Chatfield's role proved increasingly redundant. The former Cabinet positions of First Lord of the Admiralty, Secretary of State for War and Secretary of State for Air (responsible for the Royal Navy, British Army and Royal Air Force respectively) were incorporated into it and the offices of the Admiralty, War Office and the Air Ministry were abolished and their functions transferred to an expanded Ministry of Defence.
In 1946, the three posts of Secretary of State for War, First Lord of the Admiralty, and Secretary of State for Air became formally subordinated to that of Minister of Defence, which had itself been created in 1940 for the co-ordination of defence and security issues.

Ministry of Defence (United Kingdom)

Ministry of DefenceMoDUK Ministry of Defence
It replaced the positions of First Lord of the Admiralty, Secretary of State for War, and Secretary of State for Air, as the Admiralty, War Office and Air Ministry were merged into the Ministry of Defence (the Secretary of State for War had already ceased to be a cabinet position in 1946, with the creation of the cabinet-level Minister of Defence). Her Majesty's Principal Secretary of State for Defence (Defence Secretary) is a senior official within Her Majesty's Government and head of the Ministry of Defence (MoD). The former Cabinet positions of First Lord of the Admiralty, Secretary of State for War and Secretary of State for Air (responsible for the Royal Navy, British Army and Royal Air Force respectively) were incorporated into it and the offices of the Admiralty, War Office and the Air Ministry were abolished and their functions transferred to an expanded Ministry of Defence.
From 1946, the three posts of Secretary of State for War, First Lord of the Admiralty, and Secretary of State for Air were formally subordinated to the new Minister of Defence, who possessed a seat in the Cabinet.

A. V. Alexander, 1st Earl Alexander of Hillsborough

A. V. AlexanderA.V. AlexanderEarl Alexander of Hillsborough
He was three times First Lord of the Admiralty, including during the Second World War, and then Minister of Defence under Clement Attlee.

Minister of Defence (United Kingdom)

Minister of DefenceMinister of DefenseBritish Minister of Defence
It replaced the positions of First Lord of the Admiralty, Secretary of State for War, and Secretary of State for Air, as the Admiralty, War Office and Air Ministry were merged into the Ministry of Defence (the Secretary of State for War had already ceased to be a cabinet position in 1946, with the creation of the cabinet-level Minister of Defence).
In 1964, the creation of a single, merged Ministry of Defence and the abolition of the separate service ministries in the UK led to the creation of the new post of Secretary of State for Defence, more popularly known as Defence Secretary.

Ministry of Defence (1947–64)

Ministry of DefenceParliamentary Secretary to the Minister of DefenceParliamentary Secretary to the Ministry of Defence
The post was created in 1964 as successor to the posts of Minister for Coordination of Defence (1936–1940) and Ministry of Defence (1947–64).
Under the Defence (Transfer of Functions) Act 1964 the Ministry of Defence was merged with the Admiralty, the War Office and the Air Ministry to form the current Ministry of Defence on 1 April 1964; the Minister of Defence became Secretary of State for Defence.

Admiralty

British AdmiraltyLord High Admiralthe Admiralty
It replaced the positions of First Lord of the Admiralty, Secretary of State for War, and Secretary of State for Air, as the Admiralty, War Office and Air Ministry were merged into the Ministry of Defence (the Secretary of State for War had already ceased to be a cabinet position in 1946, with the creation of the cabinet-level Minister of Defence). The former Cabinet positions of First Lord of the Admiralty, Secretary of State for War and Secretary of State for Air (responsible for the Royal Navy, British Army and Royal Air Force respectively) were incorporated into it and the offices of the Admiralty, War Office and the Air Ministry were abolished and their functions transferred to an expanded Ministry of Defence.
Within the expanded Ministry of Defence are the new Admiralty Board which has a separate Navy Board responsible for the day-to-day running of the Royal Navy, the Army Board and the Air Force Board, each headed by the Secretary of State for Defence.

Manny Shinwell

Emanuel ShinwellEmmanuel ShinwellShinwell
He then served as Secretary of State for War, and then as Minister of Defence from 1950-51.

Conservative Party (UK)

ConservativeConservative PartyConservatives
Liam Fox and Philip Hammond, who had both previously served as Secretary of State for Defence (Fox from 2010 to 2011 and Hammond from 2011 to 2014), were appointed to the newly created office of International Trade Secretary and as Chancellor of the Exchequer respectively.

War cabinet

British War CabinetAustralian War CabinetWar Cabinet Office
When the Second World War broke out, the new Prime Minister Neville Chamberlain formed a small War Cabinet and it was expected that Chatfield would serve as a spokesperson for the three service ministers, the Secretary of State for War, the First Lord of the Admiralty and the Secretary of State for Air; however, political considerations resulted in all three posts being included in the Cabinet, and Chatfield's role proved increasingly redundant.

Cabinet of the United Kingdom

CabinetBritish Cabinetcabinet minister
The office is a British Cabinet–level position, and has been held by Ben Wallace since July 2019.

Denis Healey

Dennis HealeyHealeyDenis Healey, Baron Healey
Denis Winston Healey, Baron Healey, (30 August 1917 – 3 October 2015), was a British Labour Party politician who served as Secretary of State for Defence from 1964 to 1970, Chancellor of the Exchequer from 1974 to 1979 and Deputy Leader of the Labour Party from 1980 to 1983.

Royal Navy

RNBritish NavyBritish Royal Navy
The former Cabinet positions of First Lord of the Admiralty, Secretary of State for War and Secretary of State for Air (responsible for the Royal Navy, British Army and Royal Air Force respectively) were incorporated into it and the offices of the Admiralty, War Office and the Air Ministry were abolished and their functions transferred to an expanded Ministry of Defence.
The Defence Council delegates management of the Naval Service to the Admiralty Board, chaired by the Secretary of State for Defence.

Ian Gilmour, Baron Gilmour of Craigmillar

Ian GilmourSir Ian GilmourIan Hedworth John Little Gilmour
He served as Secretary of State for Defence in 1974, in the government of Edward Heath.

Roy Mason

MasonRoy Mason, Baron Mason of Barnsley The Right Honourable '''Roy Mason
Roy Mason, Baron Mason of Barnsley, (18 April 1924 – 19 April 2015) was a British Labour politician and Cabinet minister who was Secretary of State for Defence and Secretary of State for Northern Ireland in the late 1970s.

Francis Pym

Francis Pym, Baron PymFrancis Leslie PymLord Pym
A member of the Conservative Party, he served in various positions in the Cabinet in the 1970s and 1980s, including Foreign Secretary, Defence Secretary, Northern Ireland Secretary and Leader of the House of Commons.

John Nott

Sir John NottNottSir John William Frederic Nott
He featured heavily in the public eye as Secretary of State for Defence during the Argentine invasion of the Falkland Islands and the subsequent Falklands War.

Harold Macmillan

MacmillanHarold Macmillan, 1st Earl of StocktonMaurice Harold Macmillan
Macmillan was Minister of Defence from October 1954, but found his authority restricted by Churchill's personal involvement.

Michael Heseltine

Lord HeseltineMichael Heseltine, Baron HeseltineThe Lord Heseltine
As Secretary of State for Defence from 1983 to 1986, he was instrumental in the political battle against the Campaign for Nuclear Disarmament.

Malcolm Rifkind

Sir Malcolm RifkindRifkind The Right Honourable '''Malcolm Rifkind''' QC
Sir Malcolm Leslie Rifkind (born 21 June 1946) is a British politician who served in various roles as a Cabinet minister under Prime Ministers Margaret Thatcher and John Major, including Secretary of State for Scotland (1986–1990), Defence Secretary (1992–1995), and Foreign Secretary (1995–1997).

Thomas Inskip, 1st Viscount Caldecote

Thomas InskipSir Thomas InskipThe Viscount Caldecote
Despite this, Baldwin's choice of the Attorney General Sir Thomas Inskip provoked widespread astonishment.