The regiment had companies at Kingston, Elgin, Sussex, Shemogue, Sackville and Bay Verte, New Brunswick.
[1][6] On 6 August 1914, Details of the 74th Regiment The New Brunswick Rangers were placed on active service for local protective duty.
[2] When the Canadian Expeditionary Force was mobilized for overseas service, the 74th New Brunswick Rangers provided volunteers to form the 12th Battalion, CEF.
From June 1942 to July 1943, the battalion served in Labrador in the home defence role as part of Atlantic Command.
[2][3] On 13 September 1943, the battalion embarked for Great Britain and on 1 November 1943, was redesignated as the 10th Canadian Infantry Brigade Support Group (The New Brunswick Rangers), CIC, CASF.