A supreme logistics effort was required to push such a fleet across the Pacific. A supply train of auxiliaries (including fifteen fleet oilers) would provide underway refueling and replenishment from bases at Funafuti, Espiritu Santo, the Fijis, and Pearl Harbor. Looking beyond the Gilberts, into the Marshalls and Marianas, the service and supply forces would be obliged to move quickly into newly conquered territories and convert them into advanced rear bases to support the next westward leap. Timing must be meticulous and exact. Admiral Spruance, when interviewed by historians after the war,
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