United States Army, Japan (USARJ) is a

Major Command A command in military terminology is an organisational unit for which a military commander is responsible. Commands, sometimes called units or formations, form the building blocks of a military. A commander is normally specifically appointed ...

of the

United States Army The United States Army (USA) is the primary Land warfare, land service branch of the United States Department of Defense. It is designated as the Army of the United States in the United States Constitution.Article II, section 2, clause 1 of th ...

. It operates port facilities and a series of logistics installations throughout

Honshū , historically known as , is the largest of the four main islands of Japan. It lies between the Pacific Ocean (east) and the Sea of Japan (west). It is the seventh-largest island in the world, and the second-most populous after the Indonesian ...

and

Okinawa most commonly refers to: * Okinawa Prefecture, Japan's southernmost prefecture * Okinawa Island, the largest island of Okinawa Prefecture * Okinawa Islands, an island group including Okinawa itself * Okinawa (city), the second largest city in th ...

. USARJ participates actively with the

Japan Ground Self-Defense Force The , , also referred to as the Japanese Army, is the land warfare branch of the Japan Self-Defense Forces. Created on July 1, 1954, it is the largest of the three service branches. New military guidelines, announced in December 2010, direct ...

in bilateral training exercises and the development of bilateral plans. It commands and supports

assigned units, attached units, and augmentation forces and employs these forces in support of the commander. USARJ maintains and strengthens the credibility of deterrent power in the Pacific through maintenance of defense facilities, war reserves and operational project stocks. USARJ is headquartered at

Camp Zama is a United States Army post located in the cities of Zama, Kanagawa, Zama and Sagamihara, in Kanagawa Prefecture, Japan, about southwest of Tokyo. Camp Zama is home to the U.S. Army Japan (USARJ), I Corps (Forward), U.S. Army Aviation Batta ...

. As the Army Component Command to

United States Forces Japan is a subordinate Unified combatant command, unified command of the United States Indo-Pacific Command. It was activated at Fuchū Air Base (Tokyo), Fuchū Air Station in Tokyo, Japan, on 1 July 1957 to replace the Far East Command (United State ...

(USFJ) and as a Major Subordinate Command of

United States Army Pacific The United States Army Pacific (USARPAC) is an Army Service Component Command which serves as the Army service component for United States Indo-Pacific Command. It may also serve as a Joint Task Force headquarters. The command has forces in Alas ...

(USARPAC), United States Army Japan (USARJ)/ I Corps (Forward) is responsible for providing support of Article V (Defense of Japan) and VI (ensuring regional stability) of the U.S.-Japan Mutual Security Treaty. It serves as a forward stationed Army headquarters. It supports regional security cooperation activities with the

Japan Ground Self Defense Force The , , also referred to as the Japanese Army, is the land warfare branch of the Japan Self-Defense Forces. Created on July 1, 1954, it is the largest of the three service branches. New military guidelines, announced in December 2010, direct t ...

, contributing to the security of Japan and the maintenance of peace and security in the Far East, and provides communities of excellence and installation operations that support Soldiers, Civilians, and their Families.

Units

The following units make up US Army Japan: * United States Army Japan, Honshu, Japan ** I Corps (Forward) ** U.S. Army Garrison Japan (Camp Zama) *** United States Army Aviation Battalion, Japan ***35th Combat Sustainment Support Battalion ****623rd Movement Control Team *** 78th Signal Battalion *** 311th Military Intelligence Battalion ***United States Army Japan Band ***836th Transportation Battalion ***Ammunition Depot, 10th Support (Group Regional) ***10th Missile Defense Battery (TPY-2 Radar) ***14th Missile Defense Battery (TPY-2 Radar) ***88th Military Police Detachment ***901st Military Police Detachment ***403rd Army Field Support Brigade Northeast Asia (NEA) Battalion ***403rd Army Field Support Brigade Logistics Readiness Center (LRC) *** 38th Air Defense Artillery Brigade ** U.S. Army Garrison Okinawa (Torii Station) *** 10th Support (Group Regional) (Brigade-level logistics) *** 1st Battalion,

1st Air Defense Artillery Regiment The 1st Air Defense Artillery is an air defense artillery regiment in the United States Army first formed as a field artillery unit in 1821. Lineage Constituted 1 June 1821 in the Regular Army as the 1st Regiment of Artillery, and organized fro ...

(Patriot) ***1st Battalion,

1st Special Forces Group The 1st Special Forces Group (Airborne) (1st SFG) (A) is a unit of the U.S. Army Special Forces operating under the United States Pacific Command. It is designed to deploy and execute nine doctrinal missions throughout the Indo-Pacific Command ...

***247th Military Police Detachment ***835th Transportation Battalion ***505th Quartermaster Battalion *** 78th Signal Battalion
JAPAN ENGINEER DISTRICT U.S. Army Corps of Engineers
*
Brigadier General Crawford F. Sams United States Army Health Clinic Japan

DENTAC-J
** Public Health Activity - Japan

History

The earliest origins of United States Army Japan can be traced to General

Douglas MacArthur Douglas MacArthur (26 January 18805 April 1964) was an American general who served as a top commander during World War II and the Korean War, achieving the rank of General of the Army (United States), General of the Army. He served with dis ...

's assumption of command of U.S. Army Forces in the Far East. In July 1941, USAFFE was established in Manila. The command was destroyed as the U.S. were defeated in the

Japanese invasion of the Philippines Japanese may refer to: * Something from or related to Japan, an island country in East Asia * Japanese language, spoken mainly in Japan * Japanese people, the ethnic group that identifies with Japan through ancestry or culture ** Japanese diaspor ...

. After the end of the Second World War, the Army Forces Far East title was resurrected as the land forces element of the Far East Command in Tokyo. When Far East Command was disestablished in 1957, several smaller U.S. Army commands were created. U.S. Army Japan (USARJ) first appeared on 1 July 1957 as a major subordinate command of

(USARPAC) in Hawaii. Reorganized in September 1968, USARJ employed a new structure to maximize operational efficiency, while keeping its existing missions and functions. In May 1972, the reversion of Okinawa to Japanese control resulted in the realignment of the Army's Pacific commands, with HQ USARJ absorbing elements for Okinawa, adjusting the command chain.

IX Corps 9 Corps, 9th Corps, Ninth Corps, or IX Corps may refer to: France * 9th Army Corps (France) * IX Corps (Grande Armée), a unit of the Imperial French Army during the Napoleonic Wars Germany * IX Corps (German Empire), a unit of the Imperial German ...

was transferred from Okinawa, and collocated with this command, to become HQ USARJ/IX Corps. In July 1974, a USARJ reorganization established three subordinate commands: U.S. Army Garrison, Honshu (USAGH); U.S. Army Garrison, Okinawa (USAGO); and the U.S. Army Medical Department Activity-Japan, (MEDDAC-JAPAN). In January 1975, with the discontinuance of USARPAC, USARJ was designated a major Army command, reporting directly to the Department of the Army. In August 1990, USARPAC was reestablished. USARJ became a major subordinate command of that headquarters, as well as continuing as the Army Component Command of U.S. Forces, Japan (USFJ). In 1994, IX Corps was replaced by 9th Theater Army Area Command. In November 1999, it was redesignated the 9th Theater Support Command (TSC). There were several minor reorganizations and redesignations over the next decade, so that by September 2001, USARJ consisted of logistics bases in Japan and Okinawa. In September 2007, the 9th TSC was inactivated. In December 2007, I Corps (Forward) was activated in Japan in line with the Army's transformation efforts. USARJ remains headquartered at Camp Zama, where it engages in numerous bilateral activities with the Japan Ground Self-Defense Force (JGSDF), and performs duties as

's Army Component Command. Command of the 78th Signal Battalion remained with the Hawaii-based 516th Signal Brigade (formerly 1106th) and operational control remains with the commander, USARJ/9th TAAC and since December 2007, USARJ/I Corps (Forward). On 11 March 2011, a devastating magnitude 9.0 earthquake and tsunami struck the northeast coast of Japan. Within minutes, USARJ began humanitarian assistance and disaster relief operations in support of the JGSDF during Operation Tomodachi, Japan's largest-ever bilateral operation. USARJ supported the affected people after operations officially ended, by providing equipment and maintenance support to the JGSDF until September.

Notes

External links

United States Army, Japan
{{Authority control 1957 establishments in Japan

Army An army, ground force or land force is an armed force that fights primarily on land. In the broadest sense, it is the land-based military branch, service branch or armed service of a nation or country. It may also include aviation assets by ...

Japan Japan is an island country in East Asia. Located in the Pacific Ocean off the northeast coast of the Asia, Asian mainland, it is bordered on the west by the Sea of Japan and extends from the Sea of Okhotsk in the north to the East China Sea ...

Military units and formations established in 1957