Heh, I’m saving the top one. Those are great.
It’s not sad if I can instantly tell what episode the top screenshot was from, is it?
I also believe the soon-to-be-late redshirt isn't an ensign at all (they have one thin stripe on the cuff), but that rarest of beings, a Starfleet enlisted man. Starfleet seems to be the only organization in the galaxy made up of 99.5% officers.
That could also explain why the greenest of ensigns still get individual quarters aboard a starship the equivalent of a Second Class cabin on a cruise ship.