The Canadian Rangers (often mistakenly called the Arctic Rangers) are a sub-component of the Canadian Armed Forces reserve that provide a military presence in Canada's sparsely settled northern, coastal, and isolated areas. Formally established on May 23, 1947, a primary role of this part-time force is to conduct surveillance or sovereignty patrols (SOV PATS) as required. Some Canadian Rangers also conduct inspections of the North Warning System (NWS) sites and act as guides, scouts, and subject-matter experts in such disciplines as wilderness survival when other forces (such as Army units of the Regular Force or Primary Reserve) are in their area of operations.