Gemsbok sailed 12 January 1944 for the Marshall Islands and until May 1945 delivered fuel oil, aviation gasoline, and lube oil to warships in that archipelago and in the Mariana Islands. Her principal base of operations was Eniwetok but in addition Gemsbok supplied fuel at Majuro and Kwajalein, and from 5 July to 16 September 1944 was at Saipan servicing ships engaged in the capture and occupation of bases in the Marianas.