United States Army, Japan (USARJ) consists of about 2,000 soldiers and is charged, during peacetime, with operating port facilities and a series of logistics installations throughout Honshū and Okinawa. USARJ participates actively with the Japan Ground Self-Defense Force in bilateral training exercises and the development of bilateral plans. It commands and supports United States Army 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, along with the 9th Theater Support Command, is headquartered at Camp Zama.
United States Army, Japan consists of:
U.S. Army Garrison, Japan
9th Theater Support Command, Camp Zama, Japan (the former IX Corps)