The USS "White Plains" completed her outfitting at Astoria, Oregon, on 4 December 1943, and then she began shakedown training on 8 December. At the conclusion of her initial cruise, the warship entered San Diego on 21 December. On 30 December, she returned to sea, bound for the Gilbert Islands. She arrived at Tarawa Atoll on 11 January 1944 and unloaded the aircraft she had transported. On 17 January, the ship headed back to Oahu, arriving in Pearl Harbor six days later. Following a four-day turnaround period, the "White Plains" again set course for the Central Pacific to provide aircraft logistics support for the Marshall Islands operation. By the time she reached Tarawa on 3 February, the undefended Majuro Atoll had been occupied, and the Japanese garrison at Kwajalein Atoll had been all but subdued. On the next day, she got underway for Majuro where she arrived on 5 February. From there, the escort carrier moved on to Kwajalein for a brief visit before heading back to Hawaii. The "White Plains" stopped briefly at Oahu before continuing on toward the West Coast on 23 February. She arrived at Alameda, California, on San Francisco Bay on 3 March.