A mural painting in a classroom at the I19 Norrbotten's regiments barracks, near Lomben.

Swedish Army Sergeant Major Fredrik Flink of the Subarctic Warfare Center

The view through thermal binoculars, during a demonstration of thermal camouflage tents, at the I19 Norrbotten's regiments barracks

Demonstration of the capabilities of a Swedish Army Hagglunds BV 206 vehicle, in the marshes near Lomben

Participants in the High North Indoctrination Course learn to use the Ksp 58 machine gun, near Lomben

Participants in the High North Indoctrination Course load ammunition to train with the Ksp 58 machine gun

British Royal Marines Gary Goodfellow, Thor Tangaa of the Danish Army and Danish Army Master Sergeant Morten Wearum, listen to safety instructions before a live fire training with the Ksp 58 machine gun, at the training range of the I19 Norrbotten Regiment

A team of British Army Rangers trains with the anti-tank weapon Carl Gustaf, at the training range of the I19 Norrbotten Regiment, near Lomben

Smoke rises as participants in the High North Indoctrination Course shoot smoke ammunitions with the anti-tank weapon Carl Gustaf, at the training range of the I19 Norrbotten Regiment

A Carl Gustaf anti-tank weapon on the ground, at the training range of the I19 Norrbotten Regiment, near Lomben

Smoke is left behind the participants in the High North Indoctrination Course, after they train with the anti-tank weapon Carl Gustaf, at the training range of the I19 Norrbotten Regiment

Swedish Army Master Sergeant Jonas Malmquist assembles a stretcher, prior to live ammunition contact drills

French and Italian participants in the High North Indoctrination Course discuss their team strategy prior to a live ammunition contact drill, in a forest near Lomben

A stretcher and medical supplies during live ammunition contact drills, in the forest near Lomben

A British Army Ranger is ready to practice before a live ammunition contact drill, in a forest near Lomben

A team of British Army Rangers practices before a live ammunition contact drill, in a forest near Lomben

A team of British Army Rangers practices before a live ammunition contact drill, in a forest near Lomben

Spanish Army Staff Sergeant Santiago cleans and oils his weapon after a live ammunition contact drill in a forest near Lomben

Spanish Army Staff Sergeant Santiago, Danish Army Sergeant 1st class Victor Hornbaeck and a Dutch soldier rest between live ammunition contact drills in a forest near Lomben

A drone flies above the forest where the participants in the High North Indoctrination Course set up camp the evening before, near Lomben

Swedish Army Master Sergeant Jonas Malmquist flies a drone equipped with a thermal camera, to check the students' ability to use thermal camouflage on their camps in the forests near Lomben

Swedish Army Master Sergeant Jonas Malmquist walks in the forest before sunrise to check the camps of the participants in the High North Indoctrination Course

The marshes typical of the subarctic region, as seen from a Swedish Army Hagglunds BV 206 vehicle, near Lomben