The first two digits of the ASN are significant.First digit 1: indicates enlisted status.20: Indicates National Guard. 3: Indicates Draftee. The second digit indicates state groupings.This breakdown can be found on page 42 of the 1943 Officers Guide as the state groupings correspond to the 9 Army Service Commands. Enlisted status is the one which would be the most likely to put you on a wrong course.OCCASSIONALLY a man is encounterd who was "on a road trip" when he decided to enlist in the Army.Thus his ASN would give a modern researcher a false lead.The second digit would reflect the location of the recruiting office rather than the man's real home state. 20 and 3 ASNs are more reliable.In the case of 20 (third digit represents state group) the reserve component is likely to be in the geographical area of his residence. Similarly the man who is drafted is registered to his "local draft board" so ASNs starting with 3 will MOST likely reflect residence. I have been particularly successful locating individuals with this method--even to the degree of finding a single man with a fairly common last name in the vast expanse of Area 7.It works.Now it the guy you're looking for is John Smith--fogetaboudit!!!!! This system applies to ARMY and AAF and USAF up til 1955. Officers numbers are sequential and not relevant to where the man received his commission. Navy and Marine numbers are a complete mystery. Send me the man's number and I'll give it a shot for you.Shouldn't take more than a day. Dave PS: Make sure you include all the numbers and letters on the tag.