An engineer, Jack Braithwaite, examines a British Merlin helicopter in a heated hangar in the Arctic. Joint Helicopter Command trains in Bardufoss, Norway every year.

845 Naval Air Squadron is a squadron of the Royal Navy's Fleet Air Arm. Part of the Commando Helicopter Force, it is a specialist amphibious unit operating the Leonardo Commando Merlin Mk3 helicopter and provides troop transport and load lifting support to 3 Commando Brigade Royal Marines.

©Fredrik Naumann/Felix Features