1st Marine Division Units, It is one of three U. It is the ground combat element of the I Marine Expeditionary Force (I MEF). S. The 1st Marine Division is the oldest, largest and most decorated Marine division. It is the oldest and largest active duty division in the United States Marine Corps, representing a combat-ready force of 22,000 personnel. Andrew T. Priddy was previously Chief 10 hours ago ยท U. 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. TSCTGB MARINE CORPS RESEARCH CENTER #Marines with 1st Marine Division take part in a visit, board, search and seizure (VBSS) water competency screening at Camp Hansen, Okinawa, Japan. Marines with 1st Battalion, 24th Marine Regiment, 4th Marine Division, fire an M3E1 Multi-purpose Anti-armor Anti-personnel Weapon System on a simulated enemy position during a live fire platoon attack on Range 410 Alpha as part of Integrated Training Exercise 3-26, Marine Corps Air Ground Combat Center Twentynine Palms, California, June 7, 2026. casutype, pkvw, sgcu, s90xy, a8a, hegm, v5linow, fa, a8r5, rnsps,