They're called mercenaries.
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58 IMPROVEMENT In all 178,975 blacks soldiers served in the Union Army.
The US had a standing Army & Navy in 1940.
The number of German soldiers who served in the German Military in World War I was 13,250,000. The number of American military personnel that served during World War I was 4,743,826.
During WW2 around 18.2 million soldiers served in the German military. Im not sure about the US army.
About 750 people