Five weeks into their Arctic warfare training, Charlie Company have progressed from the basic survival course.
Around 200 miles inside the Arctic Circle, they are now working at integrating with their Vikings, live fire tactical training, as well as getting to grips with a mode of transport called 'skijoring' - a means of quickly transporting Marines over good ground.
Captain Roger King, Charlie Company's Second-In-Command told Forces News: "[It's] all so we can be proficient soldiers when we move on to Exercise Northern Wind, which we're working alongside NATO partners and allies as part of our collective defence."
Not everyone in Norway is an Arctic veteran and for some, it is their first time on skis.
Marine Ben Rowland says they have all tried skijoring during their novices course: "You could use that if you needed to get to a position where the ground was fairly good and you had a shorter amount of time to get there and you needed to dismount to go an assault a position," he says.
"You could use that as a really quick way of transport."
40 Commando has personnel in the desert and jungle but the Arctic Circle is seen as the toughest environment to operate in.
During the next ten years, 1,000 Royal Marines are committed to the Arctic deployment - ensuring they are prepared in the event they are required to protect the northern flank.
It is expected the near future will see the two allies begin to look in-depth at exactly how they would defend Norway.
"I think that's all part of the bigger plan," says Maj Lawson.
"At this early stage we're probably not quite into that but clearly understanding the Norwegian defence plan and how the Royal Marines fit into that is all part of it.
"Certainly, in the next ten years as we progress through this plan, you'll see greater depth, a greater understanding as to how the Royal Marines would potentially come forward and support our NATO ally if they needed us to defend their country."