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 2nd Marine Division is a division of the United States Marine Corps, which forms the ground combat element of the II Marine Expeditionary Force. The division is based at Marine Corps Base Camp Lejeune, North Carolina and headquartered at Julian C. Smith Hall.
The 1st Tank Battalion was an armor battalion of the United States Marine Corps which was based out of the Marine Corps Air Ground Combat Center Twentynine Palms, California. It last fell under the command of the 1st Marine Division and I Marine Expeditionary Force. The unit was decommissioned in May 2021 as part of the service Force Design 2030 initiative which saw it move away from larger armor formations.
Radio Battalions are tactical signals intelligence units of Marine Corps Intelligence. There are currently three operational Radio Battalions in the Marine Corps organization: 1st, 2nd, and 3rd. In fleet operations, teams from Radio Battalions are most often attached to the command element of Marine Expeditionary Units.
1st Battalion, 3rd Marines (1/3) is an infantry battalion in the United States Marine Corps based out of Marine Corps Base Hawaii. Nicknamed the "Lava Dogs", the battalion consists of approximately 800 Marines and sailors and falls under the command of the 3rd Marine Regiment of the 3rd Marine Division.
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.
1st Battalion, 4th Marines (1/4) 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. They fall under the command of the 1st Marine Regiment and the 1st Marine Division.
The 1st Battalion, 6th Marines (1/6) is an infantry battalion in the United States Marine Corps based in Camp Lejeune, North Carolina. It consists of approximately 1,100 marines and sailors. They fall under the command of the 6th Marine Regiment, the 2nd Marine Division of the II Marine Expeditionary Force.
3rd Assault Amphibian Battalion is one of two active duty assault amphibian battalions in the United States Marine Corps. The battalion's primary weapon system is the Amphibious Assault Vehicle or AAV. The AAV is a 27.5-ton armored vehicle that carries up to 21 combat-loaded Marines and is armed with the UGWS, which mounts a .50 cal (12.7 mm) M2HB machine gun and a Mk-19 40 mm grenade launcher. The battalion is also equipped with the Amphibious Combat Vehicle or ACV, a rather new variant to the USMC’s amphibious armament which will replace the AAV in years to come. The AAV and ACV are the only armored vehicles in the U.S. inventory that are fully capable of operations both on land and in the ocean. The battalion is part of the 1st Marine Division and the I Marine Expeditionary Force. The unit is based in Camp Pendleton, California.
3rd Battalion, 24th Marines (3/24) was a reserve infantry battalion in the United States Marine Corps. The battalion was first formed in 1943 for service in the Pacific Theater of Operations during World War II, taking part in a number of significant battles including those at Saipan and Iwo Jima before being deactivated at the end of the war. In the early 1960s, the unit was reactivated as a reserve battalion. It was located throughout the Midwestern United States and consisted of approximately 800 marines and sailors. The battalion was part of the 24th Marine Regiment and the 4th Marine Division. Recent operations included tours in Iraq and Afghanistan. On May 19, 2013, the battalion was deactivated (retired) as a part of 2013 Marine Corps Force Restructuring, along with the 24th Marine Regiment. 3/24 personnel were reallocated to 23rd Marine Regiment, with the majority of the companies becoming 3rd Battalion, 23rd Marines.
4th Tank Battalion was an armored battalion of the United States Marine Corps Reserve. Their primary weapon system was the M1A1 Abrams main battle tank and they were part of the 4th Marine Division and Marine Forces Reserve. The unit headquarters was at the Navy and Marine Corps Reserve Center San Diego, California, but other units in the battalion were located throughout the United States. Until the decision to divest the Marine Corps' armor capability, 4th Tank Battalion was the largest tank battalion in the US military with six lettered companies and an H&S Company.
2nd Assault Amphibian Battalion is a mechanized battalion of the United States Marine Corps. Their primary weapon system is the Amphibious Assault Vehicle. The battalion is a separate battalion within the 2nd Marine Division and the II Marine Expeditionary Force. The unit is based out of the Camp Lejeune, North Carolina
The 2nd Reconnaissance Battalion is a reconnaissance battalion in the United States Marine Corps. Located at Marine Corps Base Camp Lejeune, North Carolina, the battalion falls under the command of the 2nd Marine Division and the II 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 V Amphibious Corps (VAC) was a formation of the United States Marine Corps which was composed of the 3rd, 4th and 5th Marine Divisions in World War II. The three divisions were the amphibious landing force for the United States Fifth Fleet with two goals, removal of Japanese forces from islands so U.S. Seabees could build advance bases to project US power. In doing this VAC was notably involved in the battles for Tarawa, Saipan, and Iwo Jima. V Amphibious Corps was commanded by General Holland 'Howlin Mad' Smith followed by General Harry Schmidt.
The 68th Armor Regiment is an armored regiment of the United States Army. It was first activated in 1933 in the Regular Army as the 68th Infantry Regiment.
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.
4th Landing Support Battalion(4th LSB) was a Military Landing Support battalion of the United States Marine Corps Reserve. The unit was based out of New Orleans, Louisiana, and fell under the command of the 4th Marine Logistics Group. The Battalion has been decommissioned.
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.
Naval Mobile Construction Battalion 133 is a United States Navy Construction Battalion, otherwise known as a Seabee battalion, homeported at the Naval Construction Battalion Center. The unit was formed during WWII as the 133rd Naval Construction Battalion. It saw action and was decommissioned shortly after the war ended. The unit was reactivated as Mobile Construction Battalion 133 for the Vietnam War and remains an active unit today.
United States of America 
United States Marine Corps 
