During World War II Seaborn spent a winter training in Debert, Nova Scotia and then was posted overseas in the spring of 1943.
[4] This photo has appeared many times since in publications related to World War II and served as the basis for a stained glass window located in Ottawa, Ontario.
Following the war, Seaborn returned to the Anglican Church of Canada, serving as Rector of the Anglican Cathedral of the Holy Trinity, Quebec City and Dean of Quebec, (1948–57), Rector of St. Mary's Kerrisdale Vancouver, British Columbia (1957–58), and in both Corner Brook and St. John's, Newfoundland.
During the 1960s he was involved in the integration of the Anglican, United Church, Salvation Army, and Presbyterian educational services in Newfoundland.
[8] Along with his wife, Mary Elizabeth (Betty), he spearheaded the founding of KillDevil Camp in Gros Morne National Park in Western Newfoundland.