"Belle Grove" underwent repairs and alterations at that base before taking part in amphibious rehearsals at Maalaea Bay, Maui. On 22 January 1944, after embarking troops of the Army's 7th Infantry Division, she sailed for the Marshall Islands. The ship supported the seizure of Kwajalein Atoll, delivering troops and equipment ashore on 31 January, and then served as a floating dry dock and boat pool for the numerous landing craft required in an amphibious operation. These duties lasted until 8 February when she got underway for Pearl Harbor.