Here is the complete citation:
"Arizona, World War II Draft Registration Cards, 1940-1945." Database with images. FamilySearch. http://FamilySearch.org : accessed 2016. Records extracted by FamilySearch and images digitized by Ancestry. Citing "Draft Registration Cards for Arizona, 10/16/1940 – 3/31/1947," NAID 4684505. Records of the Selective Service System, 1926 - 1975, RG 147. National Archives at St. Louis, Missouri.You might note that the images were extracted by FamilySearch and digitized by Ancestry.
I searched for the Tanners in the database and found 87 results.
Of course, I knew a lot of these people listed and I did find a card for my own father.
Using the "Attach to Family Tree" option, I added this source to my father's entry on the Family Tree.
Here is a copy of the original registration form:
One comment I can make from this form is that my father's handwriting was much better when he was young than it became when he was older. I also noted that he was unemployed. He shortly later joined the Army and ended up in the Army Air Corps.
Finding these new records was a pleasant surprise.