Phobos steamed to the U.S. East Coast late in June; and, after shakedown in Chesapeake Bay, she loaded dry stores for fleet issue and departed Norfolk, Virginia, 29 July.

On 5 December she returned to Manus where she continued issuing supplies to ships preparing for operations at Lingayen Gulf, Luzon.

After overhaul and loading cargo she deployed to the western Pacific 25 February, via Pearl Harbor and Eniwetok, reaching Ulithi, 24 March.

During the next three months she served at this important American base and replenished ships of the U.S. 5th Fleet during the Okinawa campaign and strikes on the home islands of Japan.

Between 20 June and 5 July, she sailed to Pearl Harbor where she was stocking her holds in preparation for the scheduled invasion of Japan when the Japanese ceased hostilities.