The NARA files account for those taken into the Army/Air Corp. There was a standing army in existance of several hundred thousandwho don't show up in the file. There was a National guard of just under a million. NARA has a file on them, too. Then there was the Mavy, Marine Corps, Coast Guard and, maybe, the Merchant Marine who were accounted for elswhere. The total number was so large and so fluid I think the 16 million is just the high end of an estimate.