They were assigned to land at green beach after D-Day. On D-Day, 1st Battalion, 28th Marines (1/28) and 2nd Battalion, 28th Marines (2/28) would hit green beach. 3/28 was summoned in the battle earlier than expected. 3/28 helped fight for Mount Suribachi. On D-Day plus four the mountain was secured by a platoon from 2/28. After the capture of Mt. Suribachi the entire 28th Marine Regiment was thrown in the fight for the northern half of the island.