GROTON, Conn. (June 30, 2021) A color guard stands marches off from atop the former USS Nautilus (SSN-571) after parading the colors for Naval Submarine Medical Research Laboratory's (NSMRL) 75th anniversary celebration at Naval Submarine Base New London, June 30. For more than seven decades, NSMRL has enhanced the health, performance, and survivability of undersea warfighters through science. (U.S. Navy photo by Regena Kowitz)