Imperial Japanese Army - Growth of The IJA

Growth of The IJA

• 1870: consisted of 12,000 men.
• 1885: consisted of seven divisions including the Imperial Guard Division.
• In the early 1900s, the IJA consisted of 12 divisions, the Imperial Guard Division, and numerous other units. These contained the following:
  • 380,000 active duty and 1st Reserve personnel: former Class A and B(1) conscripts after two year active tour with 17 and 1/2 year commitment
  • 50,000 Second line Reserve: Same as above but former Class B(2) conscripts
  • 220,000 National Army
    • 1st National Army: 37 to 40 year old men from end of 1st Reserve to 40 years old.
    • 2nd National Army: untrained 20 year olds and over 40 year old trained reserves.
  • 4,250,000 men available for service and mobilization.
• 1934: army increased to 17 divisions
• 1940: 376,000 active with 2 million reserves in 31 divisions
  • 2 divisions in Japan (Imperial Guard plus one other)
  • 2 divisions in Korea
  • 27 divisions in China and Manchuria
• In late 1941: 460,000 active in 41 divisions
  • 2 divisions in Japan and Korea
  • 12 divisions in Manchuria
  • 27 divisions in China
  • plus 59 brigade equivalents.
    • Independent brigades, Independent Mixed Brigades, Cavalry Brigades, Amphibious Brigades, Independent Mixed regiments, Independent Regiments.
• 1945: 5 million active in 145 divisions (includes three Imperial Guard), plus numerous individual units, with a large Volunteer Fighting Corps.
  • includes Imperial Japanese Army Air Service.
• Japan Defense Army in 1945 had 55 divisions with 2 million men.

Total military in August 1945 was 6,095,000 including 676,863 Army Air Service.