GROTON, Conn. (Feb. 12, 2021) Cmdr. Robert Edmonson III, right, relieves Capt. Mark Robinson, left, as commanding officer of the Virginia-class submarine USS North Dakota (SSN 784) during a closed-door change-of-command ceremony on board Naval Submarine Base New London in Groton, Conn., Feb. 12. Capt. Andrew Miller, center, commodore for Submarine Squadron (SUBRON) FOUR, presided over the ceremony. North Dakota and crew operate under SUBRON FOUR whose primary mission is to provide attack submarines that are ready, willing, and able to meet the unique challenges of undersea combat and deployed operations in unforgiving environments across the globe. (U.S. Navy photo by Chief Mass Communication Specialist Joshua Karsten)