After the United States entered the war in December 1941, Canada and the U.S. coordinated their defence of the west coast of North America.

The Terrace Mutiny occurred in November 1944 among troops of Pacific Command when it was learned that the government of Prime Minister William Lyon Mackenzie King had decided to start sending conscripts to Europe to reinforce depleted combat units.

[citation needed] In August 1943 troops of Pacific Command participated in Operation Cottage, in the final stages of the Aleutian Islands campaign.

However, that campaign ended without a shot being fired at the enemy when it was discovered that the Japanese occupiers of Kiska had already evacuated the island.

The two home defence infantry divisions attached to Pacific Command were thus broken up and their personnel were redistributed to other formations.