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.

After replenishing her holds, Phobos departed 18 November and during the rest of the month she provisioned ships of the U.S. 7th Fleet in the New Hebrides and New Guinea.

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.