With control of the Philippines secured, "Haskell" was next assigned to the giant Okinawa operation. She completed loading troops and supplies at Leyte 13 March 1945 and after amphibious exercises sailed 27 March for Okinawa. This massive invasion, climax of the Pacific island-hopping campaign, began 1 April. Haskell was a member of Rear Admiral Hall's Southern Attack Force, and debarked units of the 7th Division with their equipment during the first waves of the assault. During the first days of the bitter struggle she also served as an emergency hospital ship and cared for many casualties at her off shore anchorage. After unloading her troops and cargo, the transport sailed 6 April for Saipan, Marianas, thus escaping the heavy Japanese air counterattacks so valiantly endured by the ships remaining at Okinawa. Stopping at Saipan only briefly, "Haskell" steamed independently via Eniwetok and Pearl Harbor to San Francisco, where she arrived 1 May.