The is one of five active Armies of the Japan Ground Self-Defense Force headquartered at Camp Asaka in Asaka, Saitama Prefecture. Its responsibility is the defense of the Kantō and the Northern half of the Chūbu region. Organization Eastern Army, at Camp Asaka in Asaka 1st Division, at Camp Nerima in Nerima, responsible for the defense of Tokyo and the Chiba, Ibaraki, Kanagawa, Saitama, Shizuoka and Yamanashi prefectures. 12th Brigade (Air Assault), at Camp Soumagahara in Shintō, responsible for the defense of Gunma, Nagano, Niigata and Tochigi prefectures. 1st Engineer Brigade, at Camp Koga in Koga 4th Engineer Group (Construction), at Camp Zama in Sagamihara 5th Engineer Group (Construction), at Camp Takada in Jōetsu 101st Equipment Company, at Camp Koga in Koga 301st Vehicle Company, at Camp Koga in Koga 306th Engineer Company, at Camp Matsumoto in Matsumoto 307th Engineer Company, at Camp Utsunomiya in Utsunomiya Eastern Army Combined (Training) Brigade, at Camp Takeyama in Yokosuka 31st Infantry Regiment, at Camp Takeyama in Yokosuka 48th Infantry Regiment, at Camp Soumagahara in Shintō 3rd Basic Training Battalion, at Camp Itazuma in Gotemba 117th Training Battalion, at Camp Takeyama in Yokosuka Woman Army Corps Training Unit, at Camp Asaka in Asaka 2nd Anti-Aircraft Artillery Group, at Camp Matsudo in Matsudo, with Type 3 Chū-SAMs Eastern Army Aviation Group, at Camp Tachikawa in Tachikawa 4th Anti-tank Helicopter Battalion, at Camp Kisarazu in Kisarazu Eastern Army Helicopter Battalion, at Camp Tachikawa in Tachikawa Eastern Army Meteorological Company, at Camp Tachikawa in Tachikawa Logistic Support Battalion, at Camp Tachikawa in Tachikawa Eastern Army Signal Group, at Camp Asaka in Asaka 105th Signal Battalion, at Camp Asaka in Asaka 105th Command Center Signal Battalion, at Camp Asaka in Asaka 304th Central Communication Company, at Camp Asaka in Asaka Eastern Army Logistic Support Troop, at Camp Asaka in Asaka Kantō Logistic Depot, at Camp Kasumigaura in Tsuchiura Eastern Army Finance Service, at Camp Asaka in Asaka Eastern Army Medical Service, at Camp Asaka in Asaka Eastern Army Command Post Training Support, at Camp Asaka in Asaka Eastern Army Intelligence Analysis, at Camp Asaka in Asaka Eastern Army Band, at Camp Asaka in Asaka External links Eastern Army Homepage (Japanese) Armies of the Japan Ground Self-Defense Force Military units and formations established in 1960