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Japan Commissions Fifth Taigei-class Submarine

Summary by Overt Defense
Japan has commissioned its fifth Taigei-class submarine, JS Chōgei (SS-517), on March 10. Chōgei was built by Mitsubishi Heavy Industries at Kobe and after being formally transferred to the JMSDF, it joined Submarine Division 2 of Flotilla 2, stationed at Yokosuka Naval Base. In Japanese naval tradition, the word “gei” (whale) appears in the names of all Taigei-class boats, and Chōgei means “Long Whale”. The Taigei class succeeds the older Sōryū…
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Overt Defense broke the news in on Tuesday, March 17, 2026.
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