The Ottawa Memorial is a monument in Ottawa, Ontario, that "commemorates by name almost 800 men and women who lost their lives while serving or training with the Air Forces of the Commonwealth in Canada, the West Indies and the United States and who have no known grave. " Located on Sussex Drive overlooking the Ottawa River near the Rideau Falls, the monument was unveiled in 1959 by Elizabeth II, Queen of Canada. It is maintained by the Commonwealth War Graves Commission.During the Second World War, 798 men and women killed with Commonwealth air forces in or over Canadian territory.