This Day in Naval History - March 31
1854 - Commodore Matthew Perry negotiates the Treaty of Kanagawa, opening trade between the United States and Japan.
1971 - The Poseidon (C-3) missile becomes operational when USS James Madison (SSBN 627) begins her third patrol, carrying 16 tactical Poseidon missiles.
1992 - USS Missouri (BB 63), the last active American battleship, is decommissioned.