As part of TU 51.1.1, the attack cargo ship participated in the Iwo Jima assault as part of TG 51.1, the Joint Expeditionary Force Reserve. Screened by four destroyers and two destroyer escorts, "Warrick" sailed for that soon-to-be-famous island in company with Transport Divisions 31 and 33. She arrived at point "Equity" on the 19th and, during ensuing days, cruised in operating area "Porch" in keeping with her reserve status. She moved in closer to Iwo Jima on the 22nd, but was still lying to, awaiting orders, on the following day. The attack cargo ship finally commenced unloading operations on the 24th in the transport area four miles off the southeastern coast of Iwo Jima.