According to a techie friend who was involved with that Bruggen photo, not only were the jets not all serviceable, there were some down the back that didn't even have a full complement of engines or panels!
As for the lack of groundcrew representation in group photos, as a junior pilot I was once tasked to corral the sqn aircrew for a photo and went to Rects Control to arrange a suitable backdrop. A smartarse corporal made the 'what about the techies who fix 'em then sir?' comment, probably expecting a chuckle from the chief; what he got was the chief pointing to the engineers' group photos behind Rects with a sharp "There's no aircrew who fly 'em in those, now bugger off". Couldn't have put it better!