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U.S. Navy completes overhaul extending service life of nuclear-powered submarine USS Cheyenne

The submarine underwent the works at the federal Portsmouth Naval Shipyard in Kittery, Maine, at a cost of USD 315 million, with the process lasting from November 2021. In addition to a standard overhaul and replacement of reactor fuel rods, the programme included a life-extension review exceeding the originally planned 44 years of service.     According to the Department of War, the modernisation covered the sonar system and the command and com…
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defence-industry.eu broke the news in on Tuesday, December 30, 2025.
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