Laid down under a Maritime Commission contract on 1 July 1944, the attack transport Allendale (APA-127) was launched on 9 September and commissioned on 22 November. After a series of training exercises along the West Coast of the United States, the Allendale set sail for Hawaii in January 1945. Once there, she took on troops and cargo and sailed for the Philippines in late March, stopping at Eniwetok, Ulithi, and the Palau Islands.
Beginning preparations for the invasion of Okinawa, the Allendale sailed with Task Unit 51.13.24 and began lowering her boats for the operation on the morning of 1 April 1945. In spite of heavy Japanese air opposition, all of the Allendale’s cargo was successfully offloaded by 9 April, and she sailed for Saipan soon afterward. After a two-day stay in Saipan, the Allendale sailed for Pearl Harbor on her way to San Francisco, California.