An aerial view of a forest north of Boden in northern Sweden shows dugouts made by members of the Ranger Battalions, Swedish cold weather warfare specialists, as they take part in the annual "Winter Sun" exercises in March 19, 2021 to test their ability to operate in sub-Arctic climates. - In a snow-draped forest in northern Sweden, hundreds of soldiers in white-camouflaged uniforms built dugouts, patrolled on skis and laid mock ambushes to test their readiness to fight in Arctic environments. (Photo by Jonathan NACKSTRAND / AFP)