There has not been a permanent deployment of any troops to Norway since WWII.
As for guarding the Sea Lanes of Communication...specifically the exit from Russia’s Murmansk...that is a task for naval and air forces and Marines and/or Army forces would have no role in that.
As for the mutual defense treaty (NATO), Norway does not honor it.
>As for the mutual defense treaty (NATO), Norway does not honor it.
Norway was in both Afghanistan and Iraq.