The 25th Marine Regiment was activated on May 1, 1943. The 25th Marine Regiment fought in the Battles of Saipan, Tinian, Kwajalein Atoll, and Iwo Jima. During the fighting on Iwo Jima, the battalion was tasked with the securing of Airfield One, before pushing northward into the heart of the Japanese defenses. Colonel Justice M. Chambers received the Medal of Honor for his actions as 3/25's commanding officer during the battle. His citation reads, in part, that while "exposed to relentless fire, he coolly reorganized his battle-weary men, inspiring them to heroic efforts by his own valor and in leading an attack on the critical, impregnable high ground." His medals are displayed in the trophy case located at H&amp;S Brook Park, Ohio.