At which rank am I required to take my DA photo?

I’ve recently been promoted to SSG (E6). As I entered the NCO status I was always told that DA photos are taken for E6 and above. I even checked HRC’s page on DA photos and seen the same thing. However, an E8 at my unit tells me that’s false, and DA photos are to be taken after I reach E7. I even asked other higher ranking NCOs, and was told the same thing. So now I’m confused, because HRC’s page says one thing, and everybody is saying another. Does anybody know the accurate requirement?