At the onset of the war, the Allied Forces' member armed forces consisted of 3,400,000 active and reserve troops and 1,700,000 irregular troops, such as paramilitary forces, police, and civilian resistance fighters. The lead countries within the Allied Forcers were France, Germany, Great Britain, Greece, Spain, and Turkey. The Allied Forces were formed as a military and political alliance by democratic European and North American Countries to deter and defend against any further Soviet aggression.

In the 1940s and 1950s, the Union of Soviet Socialist Republics, under the leadership of General Secretary Joseph Stalin, began aggressively expanding across Eastern Europe and East Asia, invading the Republic of China, annexing the Baltic states, and installing communist satellite governments in Poland, Slovakia, Hungary, Romania and Finland. The brown nations had outposts of the USSR but were not formal participants in the war. China, shown in light blue, was not a formal member of the Allies but was invaded by the USSR during the war. World map during the latter stages of the Second World War.

Allied Forces insignia during the Second World War

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