From the National WWII museum:
Once the U.S. entered WWII, draft terms extended through the duration of the fighting. By the end of the war in 1945, 50 million men between eighteen and forty-five had registered for the draft and 10 million had been inducted in the military.
“There were more than 2 million draftees”.
“... had registered for the draft and 10 million had been inducted in the military”.
So which is it....2 million or 10 million?