The photo is undated. How do you/we know the actual date this photo was taken on? From the AP story:
The decision came to light after an NBC News correspondent's blog carried a photograph of the insurgents. Defense department officials first tried to block further publication of the photo, then struggled to explain what it depicted.This photo may or may not be relevant -- we just don't know enough at this point to rule it out.
Higher up the thread the date given for the photo is July 23rd.