She continued to discharge cargo in the Solomon Islands through the early part of 1943, bringing invaluable support to the closing phases of the Guadalcanal Campaign.

On the first of these voyages she returned captured Japanese equipment, including a "Betty" bomber, a "Tony" fighter, and several "long lance" torpedoes.

The cargo ship returned to battle during the Gilbert Islands invasion late November, landing equipment to aid in the successful assault on Tarawa.

As other units of the fleet were engaging the Japanese in the famed "Battle of Leyte Gulf", Jupiter returned to the Marianas to pick up additional material.

Following replenishment-at-sea exercises the following year, she supported outlying bases and ships until decommissioning at San Diego 23 May 1947 and joining the reserve fleet.

Arriving 29 January, she operated out of Japan, replenishing units fighting ashore until returning to San Francisco 11 August 1952.

During Jupiter's service in the Far Pacific, the 7th Fleet averted major crises in Formosa, Indonesia, and Laos; and played an important part in the Vietnam struggle.

Jupiter was then transferred to the Maritime Administration and joined the National Defense Reserve Fleet at Olympia, Washington, where she remained.