A Royal Canadian Air Force DHC-6 Twin Otter aircraft delivering supplies and personnel flies over an ice floe during Ice Exercise 2018 in the Arctic Circle, March 5, 2018. ICEX 2018 is a five-week exercise that allows the U.S. Navy to assess its operational readiness in the Arctic, increase experience in the region, advance understanding of the Arctic environment, and continue to develop relationships with other services, allies and partner organizations. Air National Guard photo by Airman 1st Class Kelly Willett