Ok, here's the final piece of the puzzle in the argument that the photo of Nguyen was taken while I was interviewing him.
This is U.S. Soccer's video of the first day of camp. Nguyen is answering my questions in the video, and you can see the fields in the background behind him, though the video is at a slightly different angle than the photo on espn.com.
Notice he's also wearing the backpack?
I don't appear in the Nguyen shot, but I'm holding my trusty microcassette recorder right in front of Bob Bradley when he's talking.