Underway again on 22 June, the vessel transited the Panama Canal between 8–10 July and arrived in San Diego, California on the 25th. She remained there until 15 August, the day after Japan capitulated, before departing that port and heading for the Central Pacific. After stops at Pearl Harbor and Eniwetok, "Atlas" arrived at Guam in the Mariana Islands late in September and performed her repair duties there until late November. On the 27th, she shaped a course back toward Eniwetok and entered the lagoon at that atoll on 4 December 1945 for a five-month tour of repair work. At the end of April 1946, she stood out of the Eniwetok anchorage to begin the voyage back to the United States. She made a stop at Pearl Harbor en route before arriving in Astoria, Oregon on 24 May. There, she joined the Pacific Reserve Fleet though she was not officially decommissioned until 13 September 1946.