USS Tambor (SS 198) sinks the Japanese stores ship Kitami Maru 50 miles southeast of Kavieng, New Ireland.
USS Gandy (DE 764) intentionally rams German submarine U 550 off Nantucket Shoals in Atlantic Ocean. USS Joyce (DE 317) and USS Peterson (DE 152) join Gandy and deploy depth charges and gunfire to sink the submarine.
USS Wisconsin (BB 64) is commissioned and joins the Pacific Fleet, providing gunfire support for the Battle for Iwo Jima and the Okinawa Campaign.
After three days of US naval and aerial bombardment and Underwater Demolition Team (UDT) beach reconnaissance during the Okinawa Campaign, the 77th Army Division lands on Ie Shima. Kamikaza attacks take their toll on Navy ships, sinking USS Pringle (DD-477) and damaging 10 other ships.
Congress passes Army-Navy Nurses Act, giving Navy Nurse Corps members commissioned rank.
Helicopters from USS Edisto (AGB-2) begin rescue operations in Montevideo, Uruguay. By April 26, they carry 277 flood victims to safety.
USNS William McLean (T-AKE 12), is christened and launched at San Diego, Calif.