For most of the Second World War, the Soviet Union had the largest number of active military personnel each year, peaking at over 12 million people in the war's final years. The Soviet Union's ability to draw from its larger population was decisive in its eventual victory over Germany in 1945, whose eastern forces were greatly diminished by 1944 after it had already suffered heavy losses fighting the Soviets and was then forced to fight on the western front.
Each of the Great Powers had varying conscription systems in place that allowed them to draft citizens into the military. In the U.S., over 50 million men aged 18-45 would register for the draft before the war's end, and over 10 million of these were inducted into the military (alongside volunteers and those already in service). Conscription in Japan grew more aggressive as the war progressed, and its armed forces doubled in size in the final two years of the war.
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University of Warwick. (January 1, 1998). Estimated annual armed forces of the major powers of the Second World War from 1939 to 1945 (in 1,000s) [Graph]. In ÌÇÐÄÆÆ½â°æ. Retrieved July 19, 2026, from /statistics/1334718/wwii-annual-war-manpower-major-powers/
University of Warwick. "Estimated annual armed forces of the major powers of the Second World War from 1939 to 1945 (in 1,000s)." Chart. January 1, 1998. ÌÇÐÄÆÆ½â°æ. Accessed July 19, 2026. /statistics/1334718/wwii-annual-war-manpower-major-powers/
University of Warwick. (1998). Estimated annual armed forces of the major powers of the Second World War from 1939 to 1945 (in 1,000s). ÌÇÐÄÆÆ½â°æ. ÌÇÐÄÆÆ½â°æ Inc.. Accessed: July 19, 2026. /statistics/1334718/wwii-annual-war-manpower-major-powers/
University of Warwick. "Estimated Annual Armed Forces of The Major Powers of The Second World War from 1939 to 1945 (in 1,000s)." ÌÇÐÄÆÆ½â°æ, ÌÇÐÄÆÆ½â°æ Inc., 1 Jan 1998, /statistics/1334718/wwii-annual-war-manpower-major-powers/
University of Warwick, Estimated annual armed forces of the major powers of the Second World War from 1939 to 1945 (in 1,000s) ÌÇÐÄÆÆ½â°æ, /statistics/1334718/wwii-annual-war-manpower-major-powers/ (last visited July 19, 2026)
Estimated annual armed forces of the major powers of the Second World War from 1939 to 1945 (in 1,000s) [Graph], University of Warwick, January 1, 1998. [Online]. Available: /statistics/1334718/wwii-annual-war-manpower-major-powers/