"Whiteside" arrived in San Francisco on 29 October to begin a seven-month tour of duty plying the waters along the west coast of North America. She visited ports ranging south to San Diego and north to Adak and Kodiak in Alaska, though for the most part she remained in Californian waters. On 10 June 1948, she departed San Francisco to return to the western Pacific. She stopped at Pearl Harbor in mid-June and then continued on to Tsingtao where she arrived on 7 July. She visited Shanghai, Sasebo, and Yokosuka in July and August. Early in September, she stopped at Subic Bay in the Philippines before continuing on to the Marianas where she made port calls at Guam and Saipan. From Saipan, she set a course for Pearl Harbor on 21 September. Following a seven-day stop at Oahu, the attack cargo ship continued her voyage east on 7 October and arrived in Oakland, California, on the 12th. She remained there until 26 November when she got underway to return to the Far East. The ship made Yokosuka late in December and visited Kogo Saki, Sasebo, and Tsingtao before beginning the return voyage late in January 1949.