The British Canadian Recruiting Mission (BCRM) operated under the British War Office (abbreviated WO or W.O. in personnel records). The War Office was also known as the British War Mission. The BCRM was created to recruit British subjects in the United States for service in the C.E.F. However, the BCRM was only one component of the War Office.

The BCRM spread across the U.S.A, but the focus is on New York City. Based upon a few sources, the BCRM in NYC consisted at least ten personnel with two primary offices. The following personnel were assigned or connected to the BCRM:

• B.Gen Wilfred Arthur White. A British General associated with the Connaught Rangers
• LtCol Cameron Alex Warren: Canadian. Chief Medical Examiner
• LtCol Campbell Arthur Stuart: French-Canadian. Military Secretary. Connaught Rangers
• Capt Paul FleetFord Sise: Canadian. Director of Recruiting. Hon. Major.
• Capt Francis Chattan Stephens: Canadian.
• Capt Alexander Cunningham Tweedie: Canadian.
• Lt. Frederick Albert Gunther: British.
• Lt Thomas Edward Allen: Irish
• J.W. Woods: Canadian. Civilian. Director of Purchasing
• George Algernon Trenholme: French-Canadian. Civilian. Audit and Finance

While there are two primary locations, some locations are still being validated. Here are the locations:

• 681 Fifth Avenue: Suspected to be BCRM and War Office HQ.
• 280 Broadway: BCRM Recruiting station
• 511 Fifth Avenue: Unverified location
• 120 Broadway: Unverified location. Possibly purchasing offices.
• Vanderbilt Hotel: a location listed for Capt Paul SISE. Unverified association to BRMC

So, here’s the real teaser. The BCRM was home to a CMPC Assistant Provost Marshal (APM) who was in charge of about 50 personnel. I don’t think this included the Royal Flying Corps APM and three subordinates for NYC. There’s clearly more to this story. For example, there’s an interesting New York Times article from 1918 on the Provost Marshal office. However, this APM is in direct support to the BCRM with authorization to enforce the Military Service Act, 1917.

Sources:
1. Who’s Who in the British War Mission in the United States of America, 1917 (Google Book: https://tinyurl.com/y9ohlt8n)
2. Richard Holt (2015) “British Blood Calls British Blood The British-Canadian Recruiting Mission of 1917-1918,” Canadian Military History: Vol. 22: Iss. 1, Article 4. Available at: http://scholars.wlu.ca/cmh/vol22/iss1/4
3. Library Archive Canada CEF record for Cameron Alexander Warren (RG 150, Accession 1992-93/166, Box 10104 – 1): http://www.bac-lac.gc.ca/eng/discover/military-heritage/first-world-war/personnel-records/Pages/item.aspx?IdNumber=298860
4. Library Archive Canada CEF record for Campbell Arthur Stuart (RG 150, Accession 1992-93/166, Box 9393 – 20): http://www.bac-lac.gc.ca/eng/discover/military-heritage/first-world-war/personnel-records/Pages/item.aspx?IdNumber=256894
5. Library Archive Canada CEF record for Francis Chattan Stephens (RG 150, Accession 1992-93/166, Box 9272 – 22): http://www.bac-lac.gc.ca/eng/discover/military-heritage/first-world-war/personnel-records/Pages/item.aspx?IdNumber=250011
6. Library Archive Canada CEF record for Alex Cunningham Tweedie (RG 150, Accession 1992-93/166, Box 9855 – 10): http://www.bac-lac.gc.ca/eng/discover/military-heritage/first-world-war/personnel-records/Pages/item.aspx?IdNumber=282067
7. Library Archive Canada CEF record for Paul Fleetford Sise (RG 150, Accession 1992-93/166, Box 8952 – 28):http://www.bac-lac.gc.ca/eng/discover/military-heritage/first-world-war/personnel-records/Pages/item.aspx?IdNumber=232053
8. Expense of Assistance of Provost Marshal in New York to be divided between the British and Canadian Governments (RG24-C-1-a. Volume/box number: 1008. File number: HQ-54-21-23-116): http://www.bac-lac.gc.ca/eng/CollectionSearch/Pages/record.aspx?app=fonandcol&IdNumber=1886766

Additional Sources:
1. Caledonian Vol 18 (Google Book: https://tinyurl.com/ycemq8gy)