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{{short description|British Commonwealth taskforce in occupied Japan, 1946–1952}}
{{Use dmy dates|date=April 2022}}
{{Use British English|date=October 2018}}

{{Infobox military unit
| unit_name = British Commonwealth Occupation Force
| image = AWM019422 Yokosuka.jpg
| caption = Commander Yuzo Tanno hands over the keys of the [[Yokosuka Naval District|Yokosuka Naval Base]] to Captain H. J. Buchanan, [[Royal Australian Navy]] on 30 August 1945.
| dates = {{start date|1946|2|21|df=yes}} {{endash}} {{end date|1952|4|28|df=yes}}
| allegiance = [[British Commonwealth]]
| role = [[Occupation of Japan|Occupation]], [[demilitarisation]] and [[Surrender of Japan|disposal of Japan's war industries]] Operate staging posts for [[Korean War]]
| size = 40,000 personnel
| garrison = [[Kure, Hiroshima]], Japan
| garrison_label = Headquarters
| commander1 = Lieutenant General [[John Northcott]] (1946) Lieutenant General [[Horace Robertson|Sir Horace Robertson]] (1946–51) Lieutenant General [[William Bridgeford]] (1951–52)
| commander1_label = Commander-in-Chief, BCOF
| notable_commanders =
| countries = {{plainlist|
* {{flag|Australia}}
* {{flag|United Kingdom}}
* {{flag|India|1880}} (until [[Indian Independence Act 1947|1947]])
* {{flag|New Zealand}}
}}
}}

The '''British Commonwealth Occupation Force''' ('''BCOF''') was the [[British Commonwealth]] taskforce consisting of [[Australian Defence Force|Australian]], [[British Armed Forces|British]], [[British Indian Army|Indian]], and [[New Zealand Defence Force|New Zealander]] military forces in [[Occupation of Japan|occupied Japan]], from 1946 until the end of occupation in 1952.

At its peak, the BCOF committed about 40,000 personnel, that comprised 25% of the occupation force, which was equal to about a third of the number of [[Supreme Commander for the Allied Powers|US military personnel]] in Japan.

==History==
===Background===
Following the [[Atomic bombings of Hiroshima and Nagasaki|dropping of the atomic bombs]] and the [[Soviet–Japanese War|entry of the Soviet Union]] into the war against Japan, the Japanese Empire surrendered to the Allies on 15 August 1945, with their government accepting the [[Potsdam Declaration]]. The [[Japanese Instrument of Surrender|formal surrender]] was signed on 2 September in [[Tokyo Bay]]. Unlike in the [[Allied-occupied Germany|occupation of Germany]], the Soviet Union had little to no influence over the [[occupation of Japan]], leaving the Americans, British, and Commonwealth Forces responsible for occupation duties.

Whilst [[United States Forces Japan]] was responsible for military government, BCOF was responsible for supervising [[demilitarisation]] and the disposal of Japan's war industries.<ref>{{Cite web|title=British Commonwealth Occupation Force 1945–52|url=https://www.awm.gov.au/articles/atwar/bcof|access-date=5 December 2020|website=Australian War Memorial}}</ref> The BCOF was also responsible for the occupation of the western prefectures of [[Shimane Prefecture|Shimane]], [[Yamaguchi Prefecture|Yamaguchi]], [[Tottori Prefecture|Tottori]], [[Okayama Prefecture|Okayama]], [[Hiroshima Prefecture|Hiroshima]], and [[Shikoku|Shikoku Island]]. BCOF headquarters was at [[Kure, Hiroshima|Kure]], a naval port near [[Hiroshima]].<ref>{{Cite web|title=The British Commonwealth Occupation Force · The Entwistle Collection|url=http://omeka.westernsydney.edu.au/entwistlecollection/bcof|access-date=16 July 2020|website=Omeka – Western Sydney University}}</ref> At the height of its involvement, the British Commonwealth Occupation Force was responsible for 20 million Japanese citizens in an area of around 57,000 km2.<ref>{{Cite web|title=British Commonwealth Occupation Force|url=https://www.rslnsw.org.au/commemoration/australias-military-heritage/british-commonwealth-occupation-force/|url-status=live|access-date=1 May 2021|website=RSL NSW|archive-url=https://web.archive.org/web/20200302125903/https://www.rslnsw.org.au/commemoration/australias-military-heritage/british-commonwealth-occupation-force/ |archive-date=2020-03-02 }}</ref>

===Occupation===
The participation of BCOF in the Allied occupation of Japan was announced on 31 January 1946, but had been planned since the end of the war. On 21 February 1946, the initial contingent arrived at the former [[Imperial Japanese Navy]] base at [[Kure]], near the devastated city of Hiroshima, which became the main base for Australian and British warships. A Royal Navy shore party took control of the port and facilities and these were commissioned as HMS ''Commonwealth'' on 3 June 1946.<ref>{{Cite web|last=Wood|first=James|title=The Australian Military Contribution to the Occupation of Japan, 1945–1952|url=https://www.awm.gov.au/system/files/documents/BCOF_history.pdf|access-date=6 December 2020|website=Australian War Memorial}}</ref>

For most of the occupation period, Australia contributed the majority of the BCOF's personnel. The initial BCOF presence included the [[Australian 34th Brigade]]; the 9th Brigade, 2nd New Zealand Expeditionary Force ([[J Force]]); and the British Indian Division (BRINDIV) (later known as BRINJAP), a composite British and Indian division made up of the British [[5th Infantry Brigade (United Kingdom)|5th Infantry Brigade Group]] (from 2nd Infantry Division in India), and the [[268th Indian Infantry Brigade]]. BCOF was supported by the [[Women's Auxiliary Service (Burma)]] (which derived its name from its formation during the Second World War, to provide amenities to Commonwealth forces in the Burmese campaign).

The [[British Pacific Fleet]] initially provided most of the naval forces, with it consisting of primarily British ships alongside contingents of Commonwealth and US ships. The air component, known as the British Commonwealth Air Forces (BCAIR), initially comprised the [[Royal Australian Air Force]]'s [[No. 81 Wing RAAF|No. 81 Fighter Wing]], four [[Supermarine Spitfire|Spitfire]] squadrons (including [[No. 11 Squadron RAF|No. 11]] and [[No. 17 Squadron RAF|No. 17]] of the [[Royal Air Force]] and [[No. 4 Squadron, Indian Air Force|No. 4]] of the [[Indian Air Force]]), and [[No. 14 Squadron RNZAF|No. 14 Squadron]] of the [[Royal New Zealand Air Force]].

During 1947, the BCOF began to wind down its presence in Japan. By 1948, BCOF was solely staffed by Australian military personnel, with all British, Indian, and New Zealand troops withdrawn from the occupation.<ref>{{Cite web |last=Matos |first=Christine de |date=6 July 2005 |title=The Allied Occupation of Japan – an Australian View |url=https://apjjf.org/-Christine-de-Matos/1765/article.html |url-status=live |archive-url=https://web.archive.org/web/20170618030237/http://apjjf.org/-Christine-de-Matos/1765/article.html |archive-date=2017-06-18 |access-date=1 May 2021 |website=The Asia-Pacific Journal: Japan Focus}}</ref> From 1950 onwards, however, BCOF bases provided staging posts for Commonwealth forces deployed to the [[Korean War]]. The BCOF was effectively wound-up in 1951, as control of Commonwealth forces in Japan was transferred to [[British Commonwealth Forces Korea]].

==Organisation==
The major units that composed the force were:
* British Indian Division<ref>{{Cite web|title=Brinjap Division|url=https://www.britishmilitaryhistory.co.uk/wp-content/uploads/sites/124/2019/07/Brinjap-Division-1945-1947.pdf|access-date=8 December 2020|website=British Military History}}</ref><ref>{{Cite web|title=Badge, Formation, BRINDIV & British Indian Division & British Commonwealth Occupation Force (Japan) & BCOF.|url=https://www.iwm.org.uk/collections/item/object/30072874|url-status=live|access-date=1 May 2021|website=Imperial War Museum|archive-url=https://web.archive.org/web/20210501082440/https://www.iwm.org.uk/collections/item/object/30072874 |archive-date=2021-05-01 }}</ref>
** [[34th Brigade (Australia)|34th Australian Infantry Brigade]]
*** [[1st Battalion, Royal Australian Regiment|65th Battalion]]
*** [[2nd Battalion, Royal Australian Regiment|66th Battalion]]
*** [[3rd Battalion, Royal Australian Regiment|67th Battalion]]
*** [[A Field Battery, Royal Australian Artillery|'A' Battery]], [[Royal Australian Artillery]]
*** [[1st Armoured Car Squadron (Australia)|1st Armoured Car Squadron]]
** [[9th Brigade (New Zealand)|9th New Zealand Infantry Brigade]] ([[J Force]])
*** [[22nd Battalion (New Zealand)|22nd Battalion]]
*** [[27th Battalion (New Zealand)|27th Battalion]]
*** [[Divisional Cavalry Regiment (New Zealand)|2nd Divisional Cavalry Regiment]]
** [[5th Infantry Brigade (United Kingdom)|5th British Infantry Brigade]] (renumbered, 25th Independent Infantry Brigade)<ref>{{Cite web|title=Badge, formation, British, 2nd Infantry Division|url=https://www.iwm.org.uk/collections/item/object/30071124|access-date=8 December 2020|website=Imperial War Museums}}</ref><ref>{{Cite web|title=Badge, formation, 25th Independent Infantry Brigade|url=https://www.iwm.org.uk/collections/item/object/30072884|access-date=8 December 2020|website=Imperial War Museums}}</ref>
*** 1st Battalion, [[Queen's Own Cameron Highlanders]]
*** 2nd Battalion, [[Dorsetshire Regiment]]
*** 2nd Battalion, [[Royal Welch Fusiliers]]
** [[268th Indian Infantry Brigade]]
*** 5th Battalion, [[1st Punjab Regiment]]
*** 2nd Battalion, [[5th Royal Gurkha Rifles]]
*** 1st Battalion, [[5th Mahratta Light Infantry]]
* British Commonwealth Air Forces:
** [[No. 81 Wing RAAF]]
*** [[No. 76 Squadron RAAF]]
*** [[No. 77 Squadron RAAF]]
*** [[No. 82 Squadron RAAF]]
** [[No. 11 Squadron RAF]]
** [[No. 17 Squadron RAF]]
** [[No. 4 Squadron IAF]]
** [[No. 14 Squadron RNZAF]]<ref>{{Cite book|last=Gillespie|first=Oliver A.|title=The Pacific|work=The Official History of New Zealand in the Second World War|publisher=War History Branch, Department Of Internal Affairs}}</ref>

==Commanders==
The position of Commander-in-Chief, BCOF was always filled by an Australian, and included:
* Lieutenant General [[John Northcott]] (February to June 1946);
* Lieutenant General [[Horace Robertson|Sir Horace Robertson]] (June 1946 to November 1951); and
* Lieutenant General [[William Bridgeford]] (November 1951 to April 1952)

The largest formation in BCOF, BRINDIV, was commanded by Major General [[David Tennant Cowan|David Cowan]], from 1945 to 1947.

==Gallery==
<gallery class="center" widths="200" heights="175">
File:General Eichelberger inspects the Australian Guard of Honor at Kure, British Commonwealth Occupation Force Headquarters.jpg|{{small|General [[Robert L. Eichelberger]] inspects Australian Guard of Honour at Kure.}}
File:Major General David Cowan inspects Indian troops in Kure, Japan, 1946.jpg|{{small|Major General [[David Tennant Cowan|David Cowan]], General Officer Commanding BRINDIV, inspects Indian troops at [[Kure, Hiroshima|Kure]], 30 March 1946.}}
File:5th Gurkha Rifles, Japan 1946.jpg|{{small|2nd Battalion, [[5th Gurkha Rifles]] marches through [[Kure, Hiroshima|Kure]], May 1946.}}
File:New Zealand Divisional Cavalry soldiers inspecting Japanese battleship model Etajima.jpeg|{{Small|New Zealand Divisional Cavalry soldiers inspecting a model of a Japanese battleship on [[Etajima]], 1946.}}|alt=New Zealand Divisional Cavalry soldiers inspecting a model of a Japanese battleship on Etajima, 1946.
File:Australian soldier John Rose with Japanese children, Ujina, Hiroshima, 1947.png|{{Small|65th Battalion, 34th Brigade Australian soldier John Rose with children in Hiroshima, 1947.}}|alt=An Australian soldier, John Rose, with Japanese children in Hiroshima, 1947.
</gallery>

==References==
{{Reflist}}

==Further reading==
* {{cite book |first=Rajendra |last=Singh |title=Post-War Occupation Forces: Japan and South-East Asia |publisher=Combined Inter-Services Historical Section (India & Pakistan) India, Orient Longmans [distributor] |location=Delhi |year=1958 |oclc=518916}}
* George Davies, ''The Occupation of Japan: The Rhetoric and the Reality of Anglo-Australasian relations 1939 – 1952'', 2001
* John Dower, ''Embracing Defeat: Japan in the Wake of World War II'', 2000
* Melissa Miles & Robin Gerster, ''Pacific Exposures: Photograph and the Australia-Japan Relationship'', 2018
* Peter Bates, ''Japan and the British Commonwealth Occupation Force 1946 – 1952,'' 1993
* Robin Gerster, ''Travels in Atomic Sunshine: Australia and the Occupation of Japan'', 2008
* Takemae Eiji, ''The Allied Occupation of Japan'', 2002
* {{cite magazine |last=Spencer |first=Tom |title=Land of the Rising Sun: British Commonwealth Air Occupation Force, Japan 1945–1948 |magazine=[[Air Enthusiast]] |issue= 94 |date=July–August 2001 |issn=0143-5450 |pages=62–66 }}

==External links==
{{commons category}}
* [https://web.archive.org/web/20080222232707/https://www.awm.gov.au/atwar/bcof.htm Australian War Memorial, ''British Commonwealth Occupation Force 1946 – 1951'']
* [https://web.archive.org/web/20141130082503/http://www.awm.gov.au/atwar/BCOF_history.pdf ''The Australian Military Contribution to the Occupation of Japan 1945–1952 / Dr James Wood'']

[[Category:British Commonwealth Occupation Force| ]]
[[Category:Military installations of Japan]]
[[Category:Australia–Japan military relations]]
[[Category:India–Japan military relations]]
[[Category:Japan–New Zealand relations]]
[[Category:Japan–United Kingdom military relations]]
[[Category:Military history of Kure, Hiroshima]]

British Commonwealth Occupation Force - Revision history

imported>Willthorpe: /* Commanders */