Post World War II submarine exercises were conducted pitting Royal Canadian Navy surface vessels alongside Royal Navy (RN) submarines in the Atlantic.

The First Canadian Submarine Squadron was formed in 1966 by the RCN with assignment for all three Oberons.

The Canadian squadron would remain after the Canadian unification of the armed services in 1968 with the submarines operating mostly under either Maritime Forces Atlantic and occasionally with Maritime Forces Pacific.

The squadron disbanded in 1996 with submarines assigned to Maritime Operations Group Five.

A-class submarines were assigned to Halifax: The division's commander reported to Flag Officer Atlantic Coast.