According to information published by the U.S. Department of War on December 23, 2025, the U.S. Navy has completed a major Service Life Extension Program refueling overhaul for USS Cheyenne (SSN 773), the last-built Los Angeles-class fast attack submarine and the first submarine to undergo an overhaul under the SLEP initiative. Conducted at Portsmouth Naval Shipyard in Kittery, Maine, the effort restores the submarine’s nuclear propulsion core, upgrades critical combat systems, and extends Cheyenne’s total service life to beyond 44 years, returning a key undersea asset to operational readiness amid growing fleet demand. Read full Naval News at this link ...
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| The upgraded U.S. Navy Los Angeles-class fast attack submarine USS Cheyenne (SSN 773) departs Portsmouth Naval Shipyard for post-overhaul sea trials in December 2025. (Picture source: U.S. Department of War) |
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