On 30 April 1943 the Royal Canadian Navy assumed responsibility for the protection and control of shipping in the North West Atlantic. This event marked the successful conclusion of a campaign by the Royal Canadian Navy to gain control of its rapidly expanding seapower and to assert autonomy in an ocean area that was of primary national interest.
"The Royal Canadian Navy's Quest for Autonomy in the North West Atlantic: 1941-43,"
Naval War College Review: Vol. 33
, Article 6.
Available at: http://digital-commons.usnwc.edu/nwc-review/vol33/iss3/6