Percy W. Nelles
Percy Walker Nelles, CB was a flag officer in the Royal Canadian Navy and the Chief of the Naval Staff from 1934 to 1944. He oversaw the massive wartime expansion of the RCN and the transformation of Canada into a major player in the Battle of the Atlantic. During his tenure Uboats raided the Gulf of St. Lawrence, Canadian Northwest Atlantic command was created, and the RCN was providing up toof all escort forces in the North Atlantic. His handling of the RCNs war effort had its opponents however, and he was removed from his post as Chief of the Naval Staff in January 1944. He was sent to London as Overseas Naval Attach, coordinating the RCN operations for Operation Overlord. He retired in January 1945 as a full Admiral.
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Source: Wikipedia