Laura Whitmore, a chemical oceanographer from the International Arctic Research Center, places water samples from a conductivity, temperature and depth (CTD) sensor into glass vials while aboard U.S. Coast Guard Cutter Healy (WAGB 20) on Sep. 17, 2023. The Coast Guard operates America’s fleet of icebreakers and is the sole source of year-round capability to provide a surface presence in the Arctic. (U.S. Department of Defense photo by Sgt. Carter Acton)