If the troops did this on their own, is there a chance they're deliberately trying to sabotage the war effort, by staging these photos themselves in order to make the war, the soldiers, and the U.S. look bad. It could explain the casualness of their posing.
Personally, I think it's a little far-fetched, but then again, we have people in the U.S. who would go to the same extremes for the same purpose.
