I am not sure what your point is, besides being pedantic. (I will wait for you to look it up.)
I was guessing more than 2 million. But out of your 16 million, ten million were drafted. Not exactly the rush of enthusiasm you would expect from the rose colored glasses worn by many on FR.
I am merely trying to correct the outdated view that EVERYONE in the service in WWII had rushed down to the recruiters office on their 18th Birthday.
My point is you need to get your figures straight. Have a good day.