The United States Marine Corps has four divisions, including the 1st Marine Division, the oldest and largest active duty division in the United States Marine Corps, headquartered in Calfornia.
The 1st Marine Division (1st MARDIV) is a Marine infantry division of the United States Marine Corps headquartered at Marine Corps Base Camp Pendleton, California. It is the oldest and largest active duty division in the United States Marine Corps, representing a combat-ready force of more than 19,000 men and women. 1st Marine Division 2nd Marine Division 3rd Marine Division 4th Marine Division 
