First ROK SSK retired at 34
Unlike many U.S. allies and Western fleets in general, which got into the submarine game post WWII, South Korea never operated surplus American fleet boats for a couple of decades, then upgraded to German SSKs– they just went German from the get-go.
South Korea’s first full-sized (not midget) submarine, ROKS Jang Bogo (SSK-61/SS-061), was recently decommissioned after nearly 34 years of service. A German HDW-made Type 209/1200 boat ordered on 12 August 1986, she was named for the 8th-century Korean admiral Chang Pogo. Launched in September 1991, she was commissioned in October 1992.
Most famously, Jang Bogo was reportedly never detected as a Red OPFOR boat during RIMPAC 2004, virtually firing 40 torpedoes, “sinking” 15 ships, including the super carrier USS John C. Stennis. A serious wakeup call to the USN when it came to ASW against a modern SSK.

040706-N-6811L-080 Pacific Ocean (July 6, 2004) – Republic of Korea Submarine Chang Bogo (SSK 61) heads out to sea during exercise Rim of the Pacific (RIMPAC). U. S. Navy photo 040706-N-6811L-080 by Photographer’s Mate 1st Class David A. Levy (RELEASED)
Eight of her sisters, upgraded by Daewoo, continue in operation in ROKN service at least for now, carrying the locally-made and very advanced White Shark heavy torpedo and submarine-launched Hae Sung anti-ship missiles. They are being replaced by a licensed copy of the German Type 214, the KSS-II/Sohn Wonyil-class, AIP-equipped 1,800-ton boats, made by HII and Daewoo.
And with that, play us out, ROKN:
