The 2nd Marine Brigade was re-designated February 1, 1941, as 2nd Marine Division. It participated in the action at the Battle of Guadalcanal, Battle of Tarawa, Battle of Saipan, Battle of Tinian and the Battle of Okinawa.
On February 1, 1941, the 2nd Marine Brigade was reorganized into the 2nd Marine Division. This new division played a significant role in several pivotal battles, including Guadalcanal, Tarawa, Saipan, Tinian, and Okinawa.