The interim group of 12 LSM(R)s transited the Panama Canal via San Diego, Honolulu, and the Philippines, headed for battle against Japan in March 1945.

This allowed the US Marines to land and control the islands and the harbor for the protection of the hospital, floating dry dock, and supply and communication ships.

The early dawn assault surprised the Japanese; the Marines took control with minimal casualties and established this haven for damaged ships.

Vice Admiral Richmond Kelly Turner was Commander of Amphibious Forces Pacific and was to be in charge of operations until the beachhead was established.

The northern half of the six-mile-wide invasion beach was assigned to Task Force 53, under the command of Rear Admiral Lawrence F. Reifsnider.

The southern half of the six-mile-wide invasion beach was assigned to Task Force 55, commanded by Rear Admiral John Leslie Hall, Jr.

Shortly before dusk, the destroyer Aaron Ward was hit by a series of six kamikazes, suffering 45 killed or missing and 49 wounded.

Sixteen radar picket stations were established around the island, in some cases almost 100 miles out, to give early warning of the Japanese planes, which might be coming from any direction.

Their job was to sound the alarm and vector fighters to intercept before the Japanese could attack the fleet anchored off Okinawa and the Allied forces and supply dump ashore.

Dennis L. Francis LSM Commander, Flotilla Nine for the period 2–20 April, Action Report indicated that "[…] these ships are not particularly suited for picket duty.