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Capt. Geonyoung Ahn, commanding officer of the Republic of Korea (ROK) submarine Ahn Mu (SS 085), center-left, speaks with Cmdr. AJ Franz, commanding officer of Los Angeles-class fast-attack submarine USS Jefferson City (SSN 759), left, and Cmdr. Greg Storer, commanding officer of Los Angeles-class fast-attack submarine USS Springfield (SSN 761), center, during a visit aboard Springfield for Exercise Silent Shark 2025.

251202-N-EH855-1126.JPG Photo By: Mass Communication Specialist 1st Class Bryan Mai

Dec 11, 2025

NAVAL BASE GUAM - NAVAL BASE GUAM (Dec. 2, 2025) – Capt. Geonyoung Ahn, commanding officer of the Republic of Korea (ROK) submarine Ahn Mu (SS 085), center-left, speaks with Cmdr. AJ Franz, commanding officer of Los Angeles-class fast-attack submarine USS Jefferson City (SSN 759), left, and Cmdr. Greg Storer, commanding officer of Los Angeles-class fast-attack submarine USS Springfield (SSN 761), center, during a visit aboard Springfield for Exercise Silent Shark 2025. Organized by Commander, Submarine Group 7 (CSG-7), Silent Shark is a long-standing bilateral exercise designed to strengthen interoperability and theater anti-submarine warfare between the U.S. and ROK. CSG-7 directs forward-deployed, combat-ready undersea forces across the Western Pacific, Indian Ocean, and Arabian Sea under U.S. 7th Fleet. (U.S. Navy photo by Mass Communication Specialist 1st Class Bryan Mai)

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