From the Navy News Service
1863 - Union gunboats pass Confederate batteries at Vicksburg.
1924 - Navy commences relief operations in Mississippi Valley floods, lasting until June 16.
1947 - Act of Congress gives Navy Nurse Corps members commissioned rank.
1959 - Helicopters from USS Edisto (AGB 2) begin rescue operations in Montevideo, Uruguay. By April 26, they had carried 277 flood victims to safety.