For those who use Ancestry.com this post on our Rootdig blog on “recommendations” and “hints” may be of interest. Crista Cowan of Ancestry.com tells what they recommendations and hints are and there’s some additional perspective from me.  
A draft registration card does not mean the individual saw active service. The registration card means that the registrant registered for the draft. That’s why he was called the registrant. Obviously some men who registered served either because they were later drafted or volunteered. Requirements as to who had to register can vary from one time period to another.
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