Participants of the Swedish Basic Winter Warfare Course rest and try to warm up in front of a fire during the course's culminating event in Arvidsjaur, Sweden, Jan. 23, 2018. Marines from the Black Sea Rotational Force and the 26th Marine Expeditionary Unit, along with troops from 9 other countries, participated in the Swedish Basic Winter Warfare Course. The course developed the participants’ capability to survive in cold-weather environment, march on skis, apply his or hers tactical skills at individual and squad levels, and to lead smaller units in winter warfare in subarctic winter conditions.