Looks like the check box has been on the form since this 2005 revision .. 10a is new and asks the same question ?
Hmmmm...
http://www.ocshooters.com/Gen/Form-4473/ATF-FORM-4473-pg1.gif
Stay safe...
To be honest from my recollection the form has always had that as an option. Haven’t filled one out in awhile but it doesn’t look unusual. Besides they should have their own category, other than being lumped into “white” which is European ancestry as opposed to carribean/central/south American ancestry.
