Midnight completed conversion for Navy use on 28 March and was assigned to the Service Force, Pacific Fleet. That same day, she was towed out of San Francisco, California, on her way to the Central Pacific. After a stop at Pearl Harbor, she continued her voyage and arrived in Majuro Lagoon on 4 May. For the next five months, she served at Majuro and Eniwetok. During that time, she was renamed Trefoil on 10 June 1944.