1st Marine Division, posts security during a squad competition at Marine Corps Air-Ground Combat Center Twentynine Palms, California, March 19, 2025. (Cpl. Migel A. Reynosa/Marine Corps) ...

On the Pacific island of Guadalcanal in 1942, the famed 1st Marine Division — the oldest, largest and most decorated division of the U.S. Marine Corps — defeated Japanese forces in a turning ...