After training exercises in the Philippines until 27 March 1945, Diphda sortied for the invasion of Okinawa, discharging her cargo in the transport area from 1 to 10 April.

She returned to Pearl Harbor on 25 April for voyage repairs and alterations, then continued to the west coast, arriving at San Francisco on 18 June.

She carried Army cargo to Wakanoura Wan, Honshū, in support of the occupation of Japan, then embarked homeward bound servicemen at Okinawa, returning with them to Portland, Oregon, on 29 November.

She made an emergency delivery of ammunition at Pusan, Korea, and offloaded the remainder of her cargo at Yokosuka before returning to San Francisco on 12 September 1950.

Six days later, she got underway for an extended tour in Korean waters during which she carried ammunition between depots in Japan and Korea and to combat units and ships.