Submarine Group 7

15/04/2026

🇦🇺 🤝🇺🇸🤝🇯🇵

March 18 - March 19, Royal Australian Navy, United States Navy, and Japan Maritime Self-Defense Force met in Yokosuka, Japan for a Trilateral Theater Anti-Submarine Warfare working group. During the working group, each party provided updates and perspectives further supporting a free and open Indo-Pacific.

08/04/2026

SWCM 61! 🇰🇷🤝🇺🇸

YOKOSUKA, Japan — The 61st iteration of the Submarine Warfare Committee Meeting (SWCM) took place at Fluckey Hall with Commander, Submarine Group (CSG) 7 and the Republic of Korea (ROK) Navy Submarine Force, March 23.

Rear Adm. Lincoln Reifsteck, commander, Submarine Group 7 hosted Rear Adm. Tae Hoon Kim, commander, ROK Navy Submarine Force (CSF), at Fluckey Hall where they discussed policies to enhance force interoperability and combined operations.

"The 61st Submarine Warfare Committee Meeting with the Republic of Korea
Navy is a continuation of the close coordination we already enjoy in the undersea domain," said Reifsteck. “Our combined force multiplies in lethality with each iteration of this event, ensuring we are able to provide sustained credible deterrence in the Indo-Pacific."

During the closing ceremony, both commanders signed SWCM 61 action items reaffirming their continued commitment towards maintaining close coordination and shared training opportunities in the coming year.

"For the past 70 years, the ROK-U.S. Alliance has served as the world’s most powerful and exemplary partnership, defending peace on the Korean Peninsula," said RADM Kim. "As the vanguard of this alliance, the ROK and U.S. submarine forces will continue to maintain a robust combined defense posture based on close cooperation and coordination."

SWCM pairs with the combined port visits, exercises, trainings, and other military cooperation activities by the U.S. and ROK submarine commands.

Recent examples of the port visits and operations stemming from the SWCM agreements are Los Angeles-class fast-attack submarine USS Greeneville’s (SSN 772) routine port visit to Busan, South Korea, December 23, 2025, for crew rest and resupply and ROKS Dosan Ahn Changho-class submarine Ahn Mu’s (SS 085) port visit to Naval Base Guam, November 17, 2025, in support of Silent Shark 2025.

U.S. and ROK submarine forces have held SWCM meetings since 1994. During these meetings, submarine force commanders and staff hold a dialogue on ways to continuing deepening the alliance and improve combined operations in support of a free and open Indo-Pacific. SWCM 60 was held in Jeju Do, Republic of Korea in May 2025.

CSG 7 directs forward-deployed, combat capable forces across the full spectrum of undersea warfare throughout the Western Pacific, Indian Ocean, and Arabian Sea.

For more news from Commander, Submarine Group 7, visit www.csp.navy.mil/csg7/

26/02/2026

Fair winds and Following seas Lt. Vegel 💨🌊

Thank you for all your hardwork and dedication!

29/01/2026

Thank you for your hard work and dedication during your time here at Submarine Group 7, Mr Tibbetts. 👏

Fair winds and following seas! 🌊

23/01/2026

"Beware the Wolf" 🐺

Seawolf-class fast-attack submarine USS Seawolf (SSN 21) pulled into Fleet Activities Yokosuka for a scheduled port visit, Jan. 8, 2025. Seawolf, homeported in Silverdale, Washington, and assigned to Submarine Development Squadron 5, is conducting routine operations in the U.S. 7th Fleet area of operations. U.S. 7th Fleet is the U.S. Navy’s largest forward-deployed numbered fleet and routinely interacts and operates with allies and partners in preserving a free and open Indo-Pacific region

17/01/2026

12/01/2026

Congratulations to our newest 1st and 2nd Class Petty Officers!

Your collars are looking extra shiny with those new chevrons! Keep up the great work!💪

29/12/2025

🙌Congratulations to our newest frocked first and second class petty officers! 🙌

24/12/2025

Japan’s Minister of Defense Shinjiro Koizumi and Chargé d’ affaires Aaron Snipe of the U.S. Embassy in Japan toured Seawolf-class fast-attack submarine USS Seawolf (SSN 21) while the submarine was on a scheduled port visit at Fleet Activities Yokosuka, Dec. 19, 2025.

防衛省（Japan Ministry of Defense） Commander Submarine Development Squadron Five アメリカ大使館 U.S. Embassy Tokyo

22/12/2025

U.S.-Japan Joint Drill 🇺🇸🤝🇯🇵

📍YOKOSUKA, Japan - The 18th iteration of U.S.-Japan Annual Joint Drill, involving the U.S. Navy, government of Japan, and the city of Yokosuka, took place on Commander, Fleet Activities Yokosuka, Dec. 18.

This year’s drill, led by Commander, Submarine Group 7, simulated a medical emergency aboard a nuclear-powered warship, the forward-deployed aircraft carrier USS George Washington (CVN 73). During the drill, the simulated injured Sailor was carried off the ship, transported to U.S. Naval Hospital Yokosuka for care and testing, and then transferred to Yokosuka Kyosai Hospital for further care.

The drill highlighted the importance medical care holds in U.S. Navy emergency protocols, displayed by the immediate priority of medical treatment for the Sailor.

The purpose of this year’s drill was to demonstrate government of Japan, city of Yokosuka, and U.S. Government senior leadership communication and cooperation during an emergency response situation.

“The Joint Drill provides an important opportunity for the government of Japan, city of Yokosuka and the U.S. Navy to work very closely together to develop and practice planning, coordination, and communication along with joint monitoring protocols,” said Ben Elijah, Naval Area Commander Communication Center program manager.

The exercise served as an opportunity to improve bilateral interoperability and led to continued developments towards refined emergency communications and coordination between participants.

“This will lead to closer cooperation with related organizations and improved monitoring capabilities,” said Kazuhiro Tani, Nuclear Regulation Authority spokesperson. “By conducting such drills, we can confirm the safety of nuclear-powered [ships] and improve transparency.”

The Joint Drill, started in 2007, simulates varying responses to minor events that can occur on U.S. nuclear powered warships. Every year, the U.S. Navy and Japan utilize their combined trainings and lessons learned, refining the operational effective and further aligning the allies’ mutual interest towards the safety and security of the region and its communities.

11/12/2025

30/11/2025

It was a pleasure having you in Yokosuka, Annapolis! 🇯🇵

USS Annapolis (SSN 760) pulled into Fleet Activities Yokosuka, Nov. 9, 2025. During the visit, Rear Adm. Lincoln Reifsteck, commander, Submarine Group 7, (CSG 7) and CSG 7 Command Master Chief Armon Owens addressed the crew and commended them for their hardwork out in the Indo-Pacific.

Annapolis, homeported in Guam, and assigned to Submarine Squadron 15, is conducting routine operations in the U.S. 7th Fleet area of operations.