four men up doing something at the starboard wing root - any idea what?
No idea at all but I can tell that the fifth one that you forgot to mention is the boss as he is standing up (see his shadow), supervising them most probably.
I guess the planes to the west have just been washed as the tarmac looks wet below the wings and the stab. Lots of them actually - or is it de-incing ?? (although the turf isn't that winter-looking and we seem to have CAVOK)
Did you notice the dozen C17s on the south part of the airport (plus 2 C5s)