Ten per cent of the US population of 160 million was in uniform for the war. This was thought to be the maximum which could be taken for military service in a modern, industrial economy without beginning to harm war production. Of this 16 million, nearly nine million served in the US Army. Another 2.7 million served in the US Army Air Force. All these were under the command of General George C. Marshall. About 3.2 million served in the US Navy, and another 700,000 served in the Navy's Marine Corps. These were under the command of Admiral Ernest King.
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The smallest military in the world belongs to Antingua and Barbuda with a total of 245 personnel.
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WACs were female reseve service personnel who helped do soldiers work so they could fight also WAVEs
There was about 9.7 million military personnel killed in world war one.
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.