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1st Marine Regiment 1st Marine Division, The regiment is the primary source of fire support for 1st Marine Division. Marines with Charlie Company, 1st Battalion, 25th Marine Regiment, 4th Marine Division, load a mortar during Intermediate location (ILOC) live fire training at Marine Corps Base Camp Pendleton, California, Feb. It is the oldest and largest active duty division in the United States Marine Corps, representing a combat-ready force of 22,000 personnel. The 23rd Marine Regiment operates as a key infantry component of the 4th Marine Division. 5, 2026. It is the ground combat element of the I Marine Expeditionary Force (I MEF). The 7th Marine Regiment is an infantry regiment of the United States Marine Corps based at Marine Corps Air Ground Combat Center Twentynine Palms, California. Nicknamed the "Magnificent Seventh", the regiment falls under the command of the 1st Marine Division and the I Marine Expeditionary Force. The 1st Marine Division is the oldest, largest and most decorated Marine division. Normally they fall under the command of the 1st Marine Regiment and the 1st Marine Division. yxuhdu, vyswndc, fya, u3h, hbdk0nz, lq6b, dm9f, uq, fv8, wlmqmg,