1922 - The world powers of the United States, Great Britain, Japan, France and Italy, sign the Washington Naval Treaty providing for limitation of naval armament.
1944 - Lt. j.g. C.I. Purnell, in his PB4Y-1 Liberator aircraft, sinks German submarine U-177 west of Ascension Island, in the South Atlantic.
1945 - U.S. Navy submarine USS Pampanito (SS 383) attacks a Japanese convoy and sinks merchant tanker Engen Maru about 200 miles northeast of Singapore. Also on this date, USS Spadefish (SS 411) sinks Japanese merchant passenger-cargo ship Shohei Maru off Port Arthur, Korea.
1973 - In accordance with the agreement at the Paris Peace Talks, Navy Task Force 78 begins Operation End Sweep, the mine clearance of North Vietnamese waters of mines laid in 1972.