GROTON, Conn. (June 17, 2023) Christie Vilsack, sponsor of the Virginia-class attack submarine pre-commissioning unit (PCU) USS Iowa (SSN 797), christens the ship during a ceremony at General Dynamics Electric Boat shipyard facility in Groton, Conn., June 16, 2023. Iowa and crew will operate under Submarine Squadron (SUBRON) 4, 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 Petty Officer 2nd Class Wesley Towner)