sentences:  USARJ is headquartered at Camp Zama.As the Army Component Command to United States Forces Japan (USFJ) and as a Major Subordinate Command of United States Army Pacific (USARPAC), United States Army Japan (USARJ)/I Corps (Forward) is responsible to provide support of Article V (Defense of Japan) and VI (ensuring regional stability) of the Mutual Security Treaty (MST).It serves as a forward stationed Army command and control headquarters; supports regional security cooperation activities with the Japan Ground Self Defense Force (JGSDF) for the purpose of contributing to the security of Japan and maintenance of peace and security in the Far East; provides communities of excellence and installation operations that support Soldiers, Civilians, and their Families.