Canadian Northwest Atlantic

It was set up at the Atlantic Convoy Conference, held in Washington, D.C., from 1–12 March 1943, and placed under the command of Rear-Admiral Leonard W. Murray on 30 April 1943 with its headquarters in Halifax, Nova Scotia.

At the Casablanca Conference held in January 1943, the Allied Chiefs of Staff agreed to hold another meeting in a couple of months' time to address outstanding matters relating to Atlantic convoys.

The British wished to raise the idea of a supreme Allied commander for all the anti-submarine operations in the Atlantic, and were intending to propose Admiral Horton, then based in Liverpool, to be that person.

The US representatives wished to withdraw from convoy escort duties in the North Atlantic, as they wanted to concentrate on the mid-Atlantic, and felt that the British and Canadians were now in a position to assume that responsibility.

King, Chief of Naval Operations and Commander in Chief of the United States Navy, met with Admiral Sir Percy Noble, Admiral Sir Henry Moore and Rear-Admiral Mansfield (formerly Chief of Staff to the C-in-C Western Approaches) of the Royal Navy, Air Vice-Marshal Durston of the Royal Air Force and Rear-Admiral Victor-Gabriel Brodeur of the Royal Canadian Navy.