All three units from the interior mobilized their members and saw active service during the Second World War with "force generation" (to use a modern phrase) conducted in a logical, progressive manner.  As at the start of the Great War, elements of these units were placed on active service on September 1, 1939 for local protective duties.  

The 24th (Kootenay) Field Brigade, R.C.A. did not proceed overseas as a formed body but its four Field Batteries were the first of the interior units to go 'active' when they mobilized on September 1, 1939.⁷⁴ These batteries would end the war with the 1st Light Anti-Aircraft Regiment (109th Battery), 2nd Anti-Tank Regiment (108th Battery), 7th Anti-Tank Regiment (111th Battery) and the 8th Army Field Regiment (107th Battery) respectively.

The British Columbia Dragoons mobilized on May 24, 1940, and effective April 1, 1941, the element not mobilized was redesignated the "9th (Reserve) Armoured Regiment (The British Columbia Dragoons)".⁷⁵ "A", "B" and "C" Squadrons of this unit continued to be located in Vernon, Kelowna and Penticton; respectively.⁷⁶

The Rocky Mountain Rangers mobilized on January 1, 1941 and formed a second battalion for service in the Reserve Army.  In August 1941, the "2nd (Reserve) Battalion, The Rocky Mountain Rangers" was reorganized⁷⁷ as shown below:  

The 24th (Kootenay) Field Brigade, R.C.A. was redesignated "24th Reserve (Kootenay) Field Regiment, R.C.A." ⁷⁹ in April 1943, with four batteries retaining the same numbers as those that had been mobilized but with "(Reserve)" incorporated in their titles.

Following the return of the active service units from overseas, all three reserve units were redesignated on April 1, 1946 to:  

* 9th Reconnaissance Regiment (The British Columbia Dragoons)⁸⁰

* 24th Field Regiment, R.C.A.⁸¹  

* The Rocky Mountain Rangers

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