Question: What Canadian Director of Military Operations and Intelligence also served as a senior staff officer in the Canadian Expeditionary Force (CEF)?

Context paragraphs:
183rd Battalion (Manitoba Beavers), CEF: The 183rd (Manitoba Beavers) Battalion, CEF was a unit in the Canadian Expeditionary Force during the First World War.  Based in Winnipeg, Manitoba, the unit began recruiting during the winter of 1915/16 throughout the Province of Manitoba.  After sailing to England in October 1916, the battalion was broken up in November 1916 and its men transferred to the following units: 100th Battalion, CEF, 107th Battalion, CEF, 108th Battalion, CEF, and the 144th Battalion, CEF.  The 183rd (Manitoba Beavers) Battalion, CEF had one Officer Commanding: Lieut-Col.  W. T. Edgecombe.

Defence Scheme No. 1: Defence Scheme No. 1 was a plan created by Canadian Director of Military Operations and Intelligence Lieutenant Colonel James "Buster" Sutherland Brown, for a Canadian counterattack of the United States.

237th Battalion (American Legion), CEF: The 237th Battalion, CEF was a unit in the Canadian Expeditionary Force during the First World War.  Based in Sussex, New Brunswick, the unit began recruiting in the Spring of 1916 in Military Districts 4, 5, 6, and 7 and was one of several "American" battalions in the CEF.  The unit was disbanded while still in Canada and its men transferred to the 97th Battalion, CEF.  The 237th Battalion, CEF had one Officer Commanding: Lieut-Col.  C. S. Bullock.

65th Battalion (Saskatchewan), CEF: The 65th Battalion (Saskatchewan), CEF was an infantry battalion of the Canadian Expeditionary Force during the Great War.  The 65th Battalion was authorized on 20 April 1915 and embarked for Great Britain on 18 June 1916.  Its personnel were absorbed by the 44th Battalion (Manitoba), CEF, 46th Battalion (South Saskatchewan), CEF, 54th Battalion (Kootenay), CEF and 72nd Battalion (Seaforth Highlanders of Canada), CEF of the 4th Canadian Division on 30 June 1916.  The battalion was disbanded on 12 October 1917.

201st Battalion (Toronto Light Infantry), CEF: The 201st (Toronto Light Infantry) Battalion, CEF was a unit in the Canadian Expeditionary Force during the First World War.  Based in Toronto, Ontario, the unit began recruiting during the winter of 1915/16 in that city.  The battalion was disbanded while still in Canada, and its men were transferred to the 170th (Mississauga Horse) Battalion, CEF and 198th (Canadian Buffs) Battalion, CEF in September 1916.  The 201st (Toronto Light Infantry) Battalion, CEF had one Officer Commanding: Lieut-Col.  E. W. Hagarty.

Canadian Expeditionary Force: The Canadian Expeditionary Force (CEF) was the designation of the field force created by Canada for service overseas in the First World War.  The force fielded several combat formations on the Western Front in France and Belgium, the largest of which was the Canadian Corps, consisting of four divisions.  The Canadian Cavalry Brigade and the Canadian Independent Force, which were independent of the Canadian Corps, also fought on the Western Front.  The CEF also had a large reserve and training organization in England, and a recruiting organization in Canada.  In the later stages of the European war, particularly after their success at Vimy Ridge and Passchendaele, the Canadian Corps was regarded by friend and foe alike as the most effective Allied military formation on the Western Front.  The Germans went so far as to call them "storm troopers" for their great combat efficiency.  In August 1918, the CEF's Canadian Siberian Expeditionary Force travelled to revolution-torn Russia.  It reinforced an anti-Bolshevik garrison in Vladivostok during the winter of 1918–19.  At this time, another force of Canadian soldiers were placed in Archangel, where they fought against Bolsheviks.

10th Battalion (Canadians), CEF: The 10th Battalion, Canadian Expeditionary Force was a Canadian field force unit created during the First World War.  Technically distinct from the Militia from which its soldiers were drawn the unit served in the Canadian Expeditionary Force (CEF), specifically in the 1st Canadian Division from 1914 to 1919.  The battalion participated in every major Canadian battle of the First World War, and set a record for the most decorations earned by a Canadian unit in a single battle at Hill 70.  The unit was known to its contemporaries simply as "The Fighting Tenth".

Bermudians in the Canadian Expeditionary Force: Many British nationals from the United Kingdom or colonies who were resident in Canada during the First World War joined the Canadian Expeditionary Force, which was deployed to the Western Front.  A sizeable percentage of Bermuda's volunteers who served in the war joined the CEF or the Royal Canadian Navy (RCN), either because they were resident in Canada already, or because Canada was the easiest other part of the British Empire and Commonwealth to reach from Bermuda (1,239 kilometres (770 miles) from Nova Scotia).  As several CEF battalions were posted to the Bermuda Garrison before proceeding to France, islanders were also able to enlist there.  Although the Bermuda Militia Artillery (BMA) and Bermuda Volunteer Rifle Corps (BVRC) both sent contingents to the Western Front, the first would not arrive there until June 1915.  By then, many Bermudians had already been serving on the Western Front in the CEF for months.  No further contingents were sent to France by the BVRC after 1916, however forty-seven BVRC NCOs and Riflemen (Privates) were permitted to re-enlist in Canada during the course of the war.  Although some enlisted in British Army organs in Canada, including the Royal Flying Corps, most joined the Canadian Expeditionary Force.  Bermudians in the CEF enlisted under the same terms as Canadians.

James Sutherland Brown: James "Buster" Sutherland Brown {'1': ", '2': ", '3': ", '4': "} (June 28, 1881 – April 14, 1951) was a Canadian military officer best known for drafting a contingency war plan in 1921 to invade and occupy several American border cities.  The style of the plan was Defence Scheme No. 1.  What is much less well known are Brown's substantial contributions in the area of planning and logistics during his service as a senior staff officer in the Canadian Expeditionary Force (CEF) on the Western Front during the First World War.

74th Battalion, CEF: The 74th Battalion, CEF was an infantry battalion of the Canadian Expeditionary Force during the Great War.  The 74th Battalion was authorized on 10 July 1915 and embarked for Great Britain on 29 March 1916 where it provided reinforcements to the Canadian Corps in the field.  On 30 September 1916 its personnel were absorbed by the 50th Battalion (Calgary), CEF, the 51st Battalion (Edmonton), CEF, the 52nd Battalion (New Ontario), CEF and the 2nd Battalion, Canadian Mounted Rifles, CEF.  The battalion was disbanded on 15 September 1917.

Supporting paragraphs: James Sutherland Brown Defence Scheme No. 1
Answer: James "Buster" Sutherland Brown