The 3rd Marine Division is a division of the United States Marine Corps based at Camp Courtney, Marine Corps Base Camp Smedley D. Butler in Okinawa, Japan. It is one of three active duty infantry divisions in the Marine Corps and together with the 1st Marine Aircraft Wing (1stMAW) and the 3rd Marine Logistics Group forms the III Marine Expeditionary Force. The division was first formed during World War II and saw four years of continuous combat in the Vietnam War. Today, elements of the 3rd Marine Division are continuously forward deployed and forward postured to carry out the US Government's mission of a Free and Open Indo-Pacific in conjunction with its sister services.
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.
3rd Battalion, 25th Marines (3/25) is 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. Currently headquartered in Brook Park, Ohio with units throughout Ohio, Tennessee, and Pennsylvania, the battalion is nicknamed "three deuce five" and consists of approximately 800 Marines and Sailors. They fall under the 25th Marine Regiment and the 4th Marine Division. Recent operations have included tours in Iraq and Afghanistan.
1st Battalion, 25th Marines (1/25) is a reserve infantry battalion in the United States Marine Corps located throughout New England and upstate New York and consisting of approximately 850 Marines and Sailors. The battalion falls under the 25th Marine Regiment in the 4th Marine Division.
The 2nd Battalion, 25th Marines (2/25) is a reserve infantry battalion in the United States Marine Corps.
The 24th Marine Regiment was one of three infantry regiments in the 4th Marine Division of the United States Marine Corps. Its last headquarters before being deactivated on 9 September 2013 was in Kansas City, Missouri.
The 23rd Marine Regiment is a reserve infantry regiment of the United States Marine Corps. It is headquartered in San Bruno, California and falls under the command of the 4th Marine Division and the Marine Forces Reserve.
1st Battalion, 23rd Marines (1/23) is one of 32 infantry battalions in the United States Marine Corps, and one of only eight battalions found in the reserve. It is located throughout Texas and Louisiana consisting of approximately 1000 Marines and Sailors. They fall under the command of the 23rd Marine Regiment and the 4th Marine Division.
2nd Battalion, 23rd Marines (2/23) is a reserve infantry battalion in the United States Marine Corps located throughout the Western United States consisting of approximately 1000 Marines and Sailors. They fall under the command of the 23rd Marine Regiment and the 4th Marine Division.
3rd Battalion, 23rd Marine Regiment (3/23) is a reserve infantry battalion in the United States Marine Corps located throughout the Southern United States consisting of approximately 800 Marines and Sailors. The battalion was first formed in 1943 for service in the Central Pacific Area 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. The battalion is headquartered in Saint Louis, Missouri, with outlying units throughout the Southern United States. 3/23 falls under the command of the 23rd Marine Regiment and the 4th Marine Division. Recent operations have included tours in Iraq and Afghanistan.
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.
Major Douglas Thomas Jacobson was a United States Marine who earned the United States' highest military honor — the Medal of Honor — for his heroic actions on Iwo Jima during World War II. "Private First Class Jacobson destroyed a total of sixteen enemy positions and annihilated approximately seventy-five Japanese, thereby contributing essentially to the success of his division's operations." He was presented the Medal of Honor by President Harry S. Truman on October 5, 1945.
The 3rd Battalion, 9th Marines (3/9) is an infantry battalion of the United States Marine Corps. Formed during World War I it served until the early 1990s when it was redesignated as 3rd Battalion, 4th Marines (3/4) during a realignment and renumbering of the Marine Corps' infantry battalions, following the deactivation of the 9th Marine Regiment. The 3rd Battalion, 9th Marines was initially a subordinate unit of the 9th Marine Regiment, 3rd Marine Division, but was later operationally transferred to the 1st Marine Division as a subordinate unit of the 7th Marine Regiment where it remained until its redesignation as 3/4.
The 4th Reconnaissance Battalion is a reserve reconnaissance battalion in the United States Marine Corps. It falls under the 4th Marine Division and Marine Forces Reserve.
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.
20th Marine Regiment was a Composite Engineer Regiment of the United States Marine Corps that fought during World War II.
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.
Austin Roger Brunelli was a highly decorated combat veteran of World War II and the Korean War. As the commanding officer of the 1st Battalion, 24th Marines during the Battle of Iwo Jima, he was awarded the Navy Cross, the United States military's second-highest decoration awarded for valor in combat. He later served as chief of staff of the 1st Marine Division in Korea and commanding general of Camp Lejeune.
Carl Albert Youngdale was a highly decorated officer of the United States Marine Corps with the rank of major general. As an artillery officer, he took part in the three major conflicts of the 20th century and completed his 36 years career as commanding general of Camp Lejeune.
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United States Marine Corps 
