GROTON, Conn. (Sept 11, 2020) Sailors assigned to Naval Submarine Base New London and Naval Submarine School march down the brow of Historic Ship Nautilus during a ceremony to commemorate the 19th anniversary of the September 11 terror attacks. The event concluded with the ceremonial retirement of an American flag. (U.S. Navy photo by Mass Communication Specialist 2nd Class Tristan B. Lotz)