Following shakedown in Chesapeake Bay, "Saugatuck" departed Norfolk for the Netherlands West Indies and the Panama Canal. On 30 April, she transited the canal; and, the next day, headed for the South Pacific. Diverted en route, she was ordered first to Pearl Harbor, thence to San Pedro, California. During the summer and fall, she carried fuels and lubricants to Espiritu Santo and Funafuti. In December, she assumed duties as station oiler at Espiritu Santo. Late in January 1944, she put to sea to rendezvous with, and refuel, fleet units engaged in the Marshalls' campaign; and, by 5 February, she had begun fueling ships in Majuro Lagoon.