The 2nd Infantry Division ("Indianhead") is a formation of the United States Army. Its current primary mission is the pre-emptive defense of South Korea in the event of an invasion from North Korea. There are approximately 17,000 soldiers in the 2nd Infantry Division, with 10,000 of them stationed in South Korea, accounting for about 35% of the United States Forces Korea personnel.
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 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 of the 11th Marines ("Patriot") is an artillery battalion comprising three 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.
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."
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.
1st Battalion 14th Marines (1/14) was a reserve artillery battalion comprising three firing batteries and a headquarters battery. The battalion was based in Alameda, California. Its primary weapon system was the M198 Howitzer. It was part of the 14th Marine Regiment of the 4th Marine Division.
3rd Battalion, 14th Marine Regiment (3/14) is a reserve artillery battalion comprising four firing batteries and a headquarters battery. The battalion is based in Bristol, Pennsylvania and its primary weapon system is the M777 howitzer with a maximum effective range of 30 km. They fall under the command of the 14th Marine Regiment and the 4th Marine Division.
5th Battalion 14th Marines (5/14) is a reserve artillery battalion of the United States Marine Corps commanded by Lieutenant Colonel Nathan Rylander, comprising four firing batteries and a headquarters battery. The battalion is based in Seal Beach, California and its primary weapon system is the M777A2 howitzer with a maximum effective range of 40 km. They fall under the command of the 14th Marine Regiment and the 4th Marine Division.
The 14th Marine Regiment is a reserve artillery regiment of the United States Marine Corps consisting of three artillery battalions and a headquarters battery. The regiment is based in Fort Worth, Texas however its units are dispersed among 15 different sites in 12 states. Its primary weapon system is the M777A2 Howitzer with a maximum effective range of 30 km however one of its battalions has converted to fire the High Mobility Artillery Rocket System (HIMARS) weapon system.
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.
The 18th Field Artillery Brigade is the XVIII Airborne Corps field artillery brigade, based at Fort Bragg, North Carolina.
The 214th Fires Brigade is an inactive field artillery brigade in the United States Army. The brigade inactivated on May 21, 2015, at Fort Sill, Oklahoma.
The 75th Field Artillery Brigade is an artillery brigade in the United States Army. It is currently based in Fort Sill, Oklahoma and supports the III Armored Corps. The brigade is officially tasked to train and prepares for combat; on orders deploys to any area of operations to plan, synchronize and execute combined, and joint fires and effects. Integrate attached ground and air maneuver forces and on order function as a maneuver headquarters in support of full spectrum operations.
In 1989, the United States Army Pacific had its headquarters at Fort Shafter in Hawaii, and its units were stationed within the United States. Overseas forces included the US Army Japan, and the Eighth US Army in South Korea.
I Corps Artillery was a United States Army division-level command active during World War I, World War II, the Korean War and the Cold War. Today the 65th Field Artillery Brigade continues the lineage of I Corps Artillery.
United States Marine Corps 
