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 25th Marine Regiment is one of two infantry regiments in the 4th Marine Division of the United States Marine Corps. From its headquarters in Fort Devens, Massachusetts, the regiment commands fifteen training centers in nine states throughout the Northeast. These units consist of approximately 3,500 reserve and active duty Marines and are located from Maine to Delaware, West Virginia and as far west as Ohio. The 25th Marines is primarily a cold weather regiment and frequently trains in northern Norway.
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.
On 15 June 1944, United States Marine forces landed on the southwest coast of the island of Saipan in the central Marianas chain; these were followed a day later by US Army forces. This invasion was part of Operation Forager, an effort to recapture the entire Marianas chain from the Empire of Japan.
The 26th Marine Regiment is an inactivated infantry regiment of the United States Marine Corps. The 26th Marines were activated in 1944 and fought in the Battle of Iwo Jima during World War II and were activated again on 1 March 1966, and fought in the Battle of Khe Sanh during the Vietnam War.
The 2nd Battalion, 28th Marine Regiment is an infantry battalion of the United States Marine Corps. The battalion which is part of the 28th Marine Regiment, 5th Marine Division, fought in the Battle of Iwo Jima during World War II. Six Marines of E Company, 2nd Battalion, 28th Marines were featured in the historical photo by Joe Rosenthal of the U.S. flag raising on top of Mount Suribachi.
The 21st Marine Regiment was an infantry regiment of the United States Marine Corps. Commissioned for service during World War II, the regiment fought in the battles of Bougainville, Guam and Iwo Jima. It fell under the command of the 3rd Marine Division and was decommissioned at the end of the war on December 20, 1945.
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.
Marine Defense Battalions were United States Marine Corps battalions charged with coastal and air defense of advanced naval bases during World War II. They maintained large anti-ship guns, anti-aircraft guns, searchlights, and small arms to repel landing forces.
The 22nd Marine Regiment is an inactive United States Marine Corps infantry regiment. The regiment was commissioned in 1942 and was placed under the command of the 1st Provisional Marine Brigade in 1944, and the 6th Marine Division in 1945. It took part in fighting at the battles of Eniwetok, Guam, and Okinawa. The regiment also participated in the occupation of northern China following the war. 22d Marines was decommissioned in March 1946.
20th Marine Regiment was a Composite Engineer Regiment of the United States Marine Corps that fought during World War II.
The 19th Marine Regiment was a composite engineer regiment of the United States Marine Corps subordinate to the 3rd Marine Division. It existed from September 1942 until September 1944. In December 1943 there was a large change of command in the Regiment. Marine engineer regiments were eventually disbanded in favor of independent engineering battalions within the parent Marine divisions.
This is an order of battle listing the Allied and Japanese forces involved in the Battle of Arawe from 15 December 1943 to 24 February 1944.
The 18th Marine Regiment was a composite engineer regiment of the United States Marine Corps subordinate to the 2nd Marine Division. It was disbanded during the war, with the 1st and 2nd battalions remaining in the Division.
The 17th Marine Regiment was a composite engineer regiment of the United States Marine Corps subordinate to the 1st Marine Division. It was formed primarily from units of the Division, and was inactivated during war with the 1st and 2nd battalions remaining in the Division.
The 13th Marine Regiment was an artillery regiment of the United States Marine Corps. The regiment was activated for service three times during the 20th century when the Marine Corps expanded to meet war time requirements. Originally activated as an infantry regiment during World War I, the unit arrived in France before the war ended but did not participate in combat operations. It was reactivated for service in World War II as the artillery regiment for the 5th Marine Division. The unit saw intense combat during the Battle of Iwo Jima, participated in occupation duty in Japan and was quickly decommissioned shortly after the war. The regiment was last activated during the Vietnam War to again provide fire support for 5th Marine Division regiments supporting operations in South Vietnam. The regiment was finally deactivated on April 30, 1970, as the Marine Corps began to draw down its force structure at the conclusion of the Vietnam War.
The 8th Antiaircraft Artillery Battalion was a United States Marine Corps antiaircraft unit that served during World War II. Formed in 1942 as the 8th Defense Battalion, its original mission was the air and coastal defense of advanced naval bases. During the war the battalion defended Tutuila in American Samoa, Wallis Island and Apamama and took part in combat operations at Okinawa. The battalion returned to the United States after the war and was decommissioned on 28 November 1945.
The 16th Antiaircraft Artillery Battalion was a United States Marine Corps antiaircraft unit that served during World War II. Formed in 1942 as the 16th Defense Battalion, its original mission was the air and coastal defense of advanced naval bases. During the war the battalion defended Johnston Island, Hawaii and Tinian and took part in combat operations at Okinawa. The battalion returned to the United States after the war and was decommissioned on 30 November 1945 at Marine Corps Base Camp Pendleton, California.
The 14th Antiaircraft Artillery Battalion was an antiaircraft unit in the United States Marine Corps that served during World War II. The battalion was originally formed in 1943 as the 14th Defense Battalion. Its mission was to provide air and coastal defense for advanced naval bases. During the war the battalion took part in combat operations in the Solomon Islands and on Guam. The battalion was decommissioned on June 30, 1945. Since then no other unit has carried the lineage and honors of the 14th Antiaircraft Artillery Battalion.
On 15 September 1944, United States Marine Corps forces landed on the southwestern shore of the island of Peleliu in the Palau island chain, 470 nautical miles due east of the Philippine island of Mindanao. This action, called Operation Stalemate II by American planners, was a phase in the Pacific Theatre of World War II. Whether possession of the island was necessary for the Allied cause has been the source of much controversy.
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United States Marine Corps 
