UK military personnel have been deployed to the Arctic conditions of northern Norway for annual cold weather training.
The warfighting drills will take place in a part of the world where temperatures can fall to lows of -30°C at this time of year.
Exercise Clockwork involves troops from all three services of the British Armed Forces.
The deployment is carried out by Air Mobility Force, to transport personnel and equipment to the Norwegian Bardufoss Air Base.
The base is north of the Arctic Circle and situated on NATO's high north frontier.
RAF Globemaster C-17, A400M, Hercules C-130 and Voyager aircraft will be used, as well as the likes of Apaches from Joint Helicopter Force, the Royal Air Force said.
Wing Commander Essex, Officer Commanding 99 Squadron, said: "The C-17 gives the RAF the strategic capability to transport large equipment, such as an Apache over long distances, that in turn can be rapidly deployed.
"It is all about adding flexibility to succeed on operations."