JOINT BASE PEARL HARBOR-HICKAM (Jan. 16, 2024) Cmdr. Michael Lilleberg, commanding officer of the Virginia-class fast-attack submarine USS Vermont (SSN 792), explains Vermont systems to Australian Secretary of the Department of Defence Greg Moriarty during a tour of the Vermont at Joint Base Pearl Harbor-Hickam, Jan. 16, 2024. Vermont, the first Block IV Virginia-class submarine to enter service, is a new construction submarine assigned to Commander, Submarine Squadron (CSS) 1. (U.S. Navy photo by Mass Communication Specialist 1st Class Scott Barnes)