180307-F-SV928-007 ICE CAMP SKATE, Alaska (March 7, 2018) Howard Reese, left, and Hector Castillo, both from the Navy’s Arctic Submarine Laboratory, measure and record ice thickness at Ice Camp Skate during Ice Exercise (ICEX) 2018. ICEX 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. (U.S. Navy photo by Airman 1st Class Kelly Willett/Released)