1943 - USS Porpoise attacked a Japanese convoy and sank the freighter Renzan Maru off northeastern coast of Honshu.
1944 - USS Ray sinks a Japanese gunboat at the mouth of Ambon Bay on Ambon Island, while USS Puffer attacks a Japanese convoy at the western entrance of the Bohol Sea, sinking an army cargo ship.
1944 - USS Herring attacks a Japanese convoy, sinking an aircraft transport ship 220 miles off Tokyo Bay.
1944 - PBY aircraft sink Japanese cargo ship Kanaiyama Maru near Lorengau, Admiralities.
1947 - U.S. Pacific Command is established. USPACOM is one of six geographic Unified Combatant Commands of the United States Armed Forces. Commander, Pacific Command is the oldest US military authority in the Pacific Command area of responsibility.
The Navy SEALs are created, with Teams One and Two formed from Underwater Demolition Teams.
The Naval Observatory introduces a system of uniform atomic time using cesium beam atomic oscillators.
