Please answer a question about the following article about Canadian Armed Forces:

The RCAF and Joint Task Force (North) (JTFN) also maintain at various points throughout Canada's northern region a chain of forward operating locations, each capable of supporting fighter operations. Elements of CF-18 squadrons periodically deploy to these airports for short training exercises or Arctic sovereignty patrols.

What patrols are organized from these locations?
Arctic sovereignty patrols.