During the early days of the Second World War Canadian Postal authorities believed that the stamps in use since 1938 should be replaced with a new issue featuring Canada's substantial contribution to war work. A new general issue to last for the duration of the hostilities was designed. Subjects depicting Canada's munitions, war supplies, shipbuilding, agriculture, her importance as a great air-training centre, and as a source of food were chosen for the pictorial stamps.
"Tribal Class" destroyer of the Royal Canadian Navy was another ship from Canadian Shipyards. The destroyers bore names of Indian tribes as: H.M.C.S. Iroquois. Destroyers of the Tribal class had the important duties of convoying men and supplies to the different war fronts and the protection of Canada's coastline.