Following her shakedown cruise in the waters off southern California, "Belle Grove" sailed for Pearl Harbor on 21 October 1943. Upon arrival, the dock landing ship conducted several rehearsals for the upcoming invasion of the Gilbert Islands. In early November, she loaded troops and equipment and set sail for Makin Island. Arriving in the lagoon off Makin on 20 November, she unloaded her embarked troops and LCMs without incident later that morning. In company with Transport Division 20 (TransDiv 20), the ship cleared the island group that evening, returning to Pearl Harbor on 2 December.