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Kittery, Maine (Dec. 12, 2025) — The improved Los Angeles-class attack submarine USS Cheyenne (SSN 773) departs Portsmouth Naval Shipyard to conduct sea trials. The submarine underwent major repairs, structural inspections, and the replacement of mechanical and electrical systems, extending its service life and ensuring the Navy’s long-term fleet readiness. As America’s leader for attack submarine maintenance, repair, and modernization, PNSY is enhancing critical warfighting capabilities by safely delivering high-quality, on-budget, and on-time service to the fleet, ensuring warfighters are battle-ready when called upon. (US Navy photo by Branden Bourque)