This Day in Naval History - March 15
1865 - In the largest amphibious operation of the war, Union forces capture Fort Fisher, N.C.
1943 - The Numbered fleet system is established.
1957 - Airship ZPG-2 lands at Naval Air Station Key West, Fla., after an 11-day non-stop flight across the Atlantic.
1966 - River Squadron 5 is established in Vietnam.