The article compares military service, gun ownership, geographic area, political affiliation, etc.....
Example:
The article indicates that 37% of white Democrat voters have guns in their households and 55% of white Republicans; 28% of Hispanic Democrats and 32% of Hispanic Republicans voters have guns in their households; 5% of Asian Democrats have guns in their households and 22% of Asian Republicans; and 17% of Black Democrat voters have guns in their households and 41% of Black Republicans have guns. Again Republicans (probably mostly conservatives and independents, as opposed to establishment GOP) of every ethnic group have a much greater likelihood of having guns in their homes. I would suggest a substantial majority of those from every ethnic group serving likely come from families that have guns in their households.