While at Bermuda she was ordered to join the Naval forces at Brest, France to provide repair services, and she did a commendable job until she sailed on 16 January 1919 for New York City.

Prometheus recommissioned on 15 May 1942 at the Bremerton Navy Yard and following shakedown, she sailed from San Francisco, California on 9 August for Pearl Harbor, Hawaii where she took in tow the drydock ARD–2 and proceeded to Nouméa, New Caledonia.

She rendered repair services from the largest warship, the USS South Dakota (BB-57), to the smallest amphibious craft, which were beginning to figure so prominently in the island-hopping campaign towards the Japanese home islands.

Following the push westward across the Pacific, Prometheus moved in the spring of 1944 from San Francisco to Tulagi, and after a month's stay there, where she catered primarily to escort carriers, she went to Florida Island and then in September to Manus.

Prometheus departed Kossol on 21 January 1945 and moved to the now famous Ulithi anchorage to help ready the Fleet for the Iwo Jima campaign and the Okinawa strikes.

Prometheus continued her rigorous schedule at Okinawa and Hong Kong during the Asian occupation, returning to San Francisco at the year's end.