When do you put the number 2 on your Non-Commissioned Officer ribbon, after completion of the course or after you get pinned?

Read a book!

As my SGL said last January when I already had my number on before walking graduation for SLC: "You ain't completed yet Squires, get that fixed! When you roll out the door and have that 1059 flapping in the window of your plane.. then you are done!"

I got a 2 on mine when the ribbon came out for graduating from 7th Army NCO Academy.