How can I obtain a copy of my grandfather's WWI and WW2 registration card. WW1 was done September 12, 1918 and WW2 was done in 1941 or 1942 He was born in 1881

I have a jpeg of a copy from the National Archives (from my late cousin) of my grandfather's draft registraion cards from WWI and WWII. 

How can I obtain a copy for me of my grandfather's WWI and WW2 registration card. WW1 was done September 12, 1918 and WW2 was done in 1941 or 1942 He was born in 1881

I tried familysearch website and they don't show a record but I know there is a record somewhere.

thank you

Maureen