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.
The 5th Marine Division was a United States Marine Corps ground combat division which was activated on 11 November 1943 at Camp Pendleton, California during World War II. The 5th Division saw its first combat action during the Battle of Iwo Jima in 1945 where it sustained the highest number of casualties of the three Marine divisions of the V Amphibious Corps. The 5th Division was to be part of the planned invasion of the Japan homeland before Japan surrendered. Assault troops of the 5th Division were included in the Presidential Unit Citation awarded to the V Amphibious Corps for extraordinary heroism on Iwo Jima from 19 to 28 February 1945. The 5th Division was deactivated on 5 February 1946.
Combat service support is a topic that is, broadly speaking, a subset of military logistics. However, combat service support is often more limited in depth, as the related groups primarily address factors supporting readiness for combat operations. The United States Department of Defense organizes various agencies providing services such as medical assistance, for example, akin to other nations' militaries.
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.
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".
3rd Battalion, 1st Marines (3/1) is an infantry battalion in the United States Marine Corps based out of Camp Horno on Marine Corps Base Camp Pendleton, California. Nicknamed the "Thundering Third", the battalion consists of approximately 1,220 Marines and Sailors and falls under the command of the 1st Marine Regiment and the 1st Marine Division.
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.
2nd Battalion, 1st Marines (2/1) is an infantry battalion in the United States Marine Corps based in Camp Horno on Marine Corps Base Camp Pendleton, California. Nicknamed "The Professionals," the battalion consists of approximately 1,200 Marines and Sailors. Normally they fall under the command of the 1st Marine Regiment and the 1st Marine Division.
1st Battalion, 5th Marines (1/5) is an infantry battalion in the United States Marine Corps based out of Marine Corps Base Camp Pendleton, California consisting of approximately 800 Marines and sailors. Nicknamed Geronimo, it falls under the command of the 5th Marine Regiment and the 1st Marine Division. The battalion was formed in 1914 and has served in every major conflict that the United States has been involved in since then.
2nd Battalion, 3rd Marines (2/3) was an infantry battalion in the United States Marine Corps based out of Marine Corps Base Hawaii consisting of approximately 1,000 Marines and sailors. The battalion fell under the command of the 3rd Marine Regiment and the 3rd Marine Division. The battalion was deactivated in January 2022 as part of the Marine Corps' ongoing Force Design efforts.
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.
5th Battalion, 11th Marines (5/11) is a High Mobility Artillery Rocket System (HIMARS) battalion consisting of four Firing Batteries and a Headquarters Battery. The battalion is stationed at Marine Corps Base Camp Pendleton, California. It is the first active duty HIMARS Unit in the Marine Corps. They fall under the command of the 11th Marine Regiment and the 1st Marine Division. This is the only battalion in the 11th Marine Regiment not using the M777A2 lightweight howitzer.
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".
Combat Logistics Regiment 3 (CLR-3) is a direct support (DS) logistics unit of the United States Marine Corps and is headquartered at Camp Foster, Okinawa, Japan. The unit falls under the 3rd Marine Logistics Group and the III Marine Expeditionary Force.
The 3d Medical Battalion is a medical support unit of the United States Marine Corps and is headquartered at Camp Foster, Okinawa, Japan. The unit falls under the command of 3rd Marine Logistics Group.
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.
The Combat Assault Battalion was a mechanized battalion of the United States Marine Corps and subordinate element of the 3rd Marine Division and the III Marine Expeditionary Force. The unit was last based at Camp Schwab, Okinawa, Japan.
The 1st Maintenance Battalion is a battalion of the United States Marine Corps that provides intermediate-level maintenance for the I Marine Expeditionary Force's tactical ordnance, engineer, motor transport, communications electronics and general support ground equipment. The Marines and Sailors of 1st Maintenance Battalion are regularly assigned and deployed around the world with command elements that deliver tactical logistics support to I MEF units. The command is based out of Camp Las Pulgas, Marine Corps Base Camp Pendleton, California and is organized under the command of the 1st Marine Logistics Group.
2d Transportation Support Battalion is a logistics unit of the United States Marine Corps that is based at Marine Corps Base Camp Lejeune, North Carolina. The battalion falls under the command of Combat Logistics Regiment 2 and the 2nd Marine Logistics Group. The battalion was reactivated October 1, 2014.
Combat Logistics Battalion 12 (CLB-12), formerly known as 3d Transportation Battalion and previously 3rd Transportation Support Battalion, is a direct support (DS) logistics unit of the United States Marine Corps and is headquartered at Camp Foster, Okinawa, Japan. The unit falls under the command of Combat Logistics Regiment 3 and the 3rd Marine Logistics Group.
United States of America
United States Marine Corps 
