PNSY Successfully Undocks Cheyenne 2025-02-10 Comments Closed News, RSS KITTERY, Maine — The Los Angeles improved-class attack submarine USS Cheyenne (SSN 773) was successfully undocked Feb. 6, marking a significant milestone in its service life extension program at Portsmouth Naval Shipyard. Related Items Military child care centers see varying effects from personnel actions 2025-04-10 Military suicides rose in 2023, continuing a troubling trend 2024-11-14 U.S., Egyptian Navies Conduct Bilateral Exercise in Red Sea 2024-11-01 Trump administration plans to cut 80,000 VA employees, memo says 2025-03-05