resembling an obscene image to observers on the ground
I am continually confused at what meets official interpretation as "obscene". If it was accurate in its depiction, then some theoretic conspiracy group determined to keep some other group ignorant of basic human anatomy might have grounds for opposing public displays - but the generic nature of the image indicates its the first group who have achieved ignorance. Perhaps that is what they are trying to keep.
"they dont know what a dick looks like, but they heard on TV it looks like that..."
Dick pics have been part of human culture for as far back as we have art, these days the behaviour seems most common amongst juveniles of whatever age..
As far is I am concerned, the action was childish - which may be a useful trait for people you want to fly into possible death, and the obscenity charge is a reponse from senior officers more concerned about being embarrassed.