The 4th Marine Division is a reserve division in the United States Marine Corps. It was raised in 1943 for service during World War II, and subsequently fought in the Pacific against the Japanese. Deactivated after the war, the division was re-formed in 1966 and elements of the division deployed during the Gulf War in 1990–1991, as well as during the Iraq War. It is currently the ground combat element of the Marine Forces Reserve and is headquartered in New Orleans, Louisiana, and has units throughout the United States.
3rd Battalion, 11th Marines (3/11) is an artillery battalion comprising three firing batteries, a Liaison Unit, and a headquarters battery. The battalion is based at the Marine Corps Air Ground Combat Center Twentynine Palms, California and its primary weapon system is the M777 lightweight howitzer with a maximum effective range of 25 miles. They fall under the 11th Marine Regiment and the 1st Marine Division.
1st Battalion, 1st Marines (1/1) is an infantry battalion in the United States Marine Corps based out of Camp Pendleton, California, consisting of anywhere from 800 to 2,000 Marines and Sailors, but the number fluctuates depending on the battalion's mission. Falling under the command of the 1st Marine Regiment and the 1st Marine Division, they are commonly referred to as "The first of the First".
The 1st Marine Logistics Group is a logistics unit of the United States Marine Corps and is headquartered at Marine Corps Base Camp Pendleton, California, with several subordinate elements also located at Marine Corps Air Station Yuma and Marine Corps Air Ground Combat Center Twentynine Palms.
The 11th Marine Regiment is an artillery regiment of the United States Marine Corps based at Marine Corps Base Camp Pendleton, California. Known as the "Cannon Cockers", the regiment falls under the command of the 1st Marine Division and the I Marine Expeditionary Force. Its primary weapon system is the M777A2 howitzer with a maximum effective range of 30 km, however the 5th Battalion has converted to fire the HIMARS weapon system.
The 1st Battalion, 7th Marines (1/7) is an infantry battalion of the 7th Marine Regiment of the United States Marine Corps. It is currently based at the Marine Corps Air Ground Combat Center Twentynine Palms. Consisting of approximately 1,000 Marines, it is part of the 1st Marine Division.
1st Battalion, 11th Marines (1/11) is an artillery battalion comprising four firing batteries and a Headquarters battery. The battalion is stationed at the Marine Corps Base Camp Pendleton in California. Its primary weapon system is the M777 lightweight howitzer. The battalion is under the command of the 11th Marine Regiment, part of the 1st Marine Division.
2nd Battalion, 11th Marines (2/11) is an artillery battalion comprising four firing batteries and a Headquarters Battery. The battalion is stationed at Marine Corps Base Camp Pendleton, California. Its primary weapon system is the M777 lightweight howitzer. The battalion was the first in the Marine Corps to fully transition from the M198 Howitzer. They fall under the command of the 11th Marine Regiment and the 1st Marine Division.
1st Battalion, 10th Marines (1/10) is an artillery battalion composed of five firing batteries and a headquarters battery. The battalion is stationed at Camp Lejeune, North Carolina and falls under the command of 10th Marine Regiment, part of 2d Marine Division. Its primary weapon system is the M777A2 155mm lightweight howitzer.
5th Battalion 10th Marines (5/10) was a US artillery battalion comprising three firing batteries and a headquarters battery. The battalion was stationed at Marine Corps Base Camp Lejeune, North Carolina, USA and its primary weapon system was the M777A2 howitzer, with a maximum effective range of 30 km. They fell under the command of the 10th Marine Regiment and the 2nd Marine Division. The battalion was known by its nickname of, "The Five and Dime."
3rd Battalion 10th Marines (3/10) was an artillery battalion that consisted of four cannon firing batteries and a headquarters battery. The battalion was stationed at Marine Corps Base Camp Lejeune, North Carolina and its primary weapon system was the M777-A2 howitzer with a maximum effective range of 30 km and the M-252 Expeditionary Fire Support System (EFSS). 3/10 fell under the 10th Marine Regiment and the 2nd Marine Division. The battalion was deactivated at Camp Lejeune on 26 April 2013.
2nd Battalion 10th Marines (2/10) is an artillery battalion of the United States Marine Corps comprising three cannon batteries, two rocket batteries, and a headquarters battery. The battalion is stationed at Marine Corps Base Camp Lejeune, North Carolina and its primary weapon systems are the M777A2 howitzer with a maximum effective range of 30 km and the M142 HIMARS with a maximum effective range of 300km. They fall under the command of the 10th Marine Regiment and 2nd Marine Division.
2nd Battalion, 14th Marines (2/14) is a reserve artillery battalion comprising three firing batteries and a headquarters battery. The battalion headquarters is in Grand Prairie, Texas. In 2006 the battalion became the first fully operational HIMARS battalion in the Marine Corps. Fox Battery, based in Oklahoma City, Oklahoma. was deployed in July 2007 in support of Operation Iraqi Freedom, and has the distinction of being the first Marine Corps HIMARS battery to deploy into combat.
Combat Logistics Battalion 7(CLB 7) is a logistics battalion of the United States Marine Corps. The unit is based out of the Marine Corps Air Ground Combat Center Twentynine Palms, California and falls under the command of the 1st Marine Logistics Group and I Marine Expeditionary Force.
The 1st Battalion 9th Marines (1/9) was an infantry battalion of the United States Marine Corps. Formed during World War I, it served until the mid-2000s when it was deactivated to make room for one of three light armor reconnaissance battalions. During the Vietnam War, 1/9 sustained an especially high casualty rate, such that it received the nickname "The Walking Dead".
The 7th Engineer Support Battalion is an engineering support unit of the United States Marine Corps and is headquartered at Marine Corps Base Camp Pendleton, California. The unit falls under the command of 1st Marine Logistics Group and the I Marine Expeditionary Force.
3rd Battalion, 12th Marines (3/12) is an artillery battalion comprising four firing batteries and a Headquarters Battery. The firing batteries are not permanently assigned to the battalion- they are all on 6-month rotations in Okinawa from the 10th Marine Regiment and the 11th Marine Regiment. The battalion is stationed at Camp Hansen, Okinawa, Japan, and its primary weapon systems are the M777 lightweight howitzer with a maximum effective range of 30 km, along with the M142 High Mobility Artillery Rocket System (HIMARS). The battalion utilizes the Unit Deployment Program to fill its four firing batteries with detachments from artillery units across the Marine Corps.
1st Battalion, 12th Marines (1/12) was an artillery battalion comprising three firing batteries and a Headquarters Battery. The battalion was stationed at Marine Corps Base Hawaii and fell under the 12th Marine Regiment and the 3rd Marine Division. It was deactivated on 26 May 2023.
3rd Combat Engineer Battalion was a combat engineer battalion of the United States Marine Corps, most recently activated from 7 October 2007 to 5 August 2014. 3rd CEB is having a reunion in Neihart, Montana May 19-22 2023 being hosted by Warrior Reunion Foundation.
9th Communication Battalion is a communications battalion in the United States Marine Corps. It is part of the I Marine Expeditionary Force and is headquartered at Marine Corps Base Camp Pendleton, California.
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United States Marine Corps 
