Two quite different versions of the same thing here. The Comox Air Show this year included demonstrations are aerial refueling with the RCAF Hornet. The first of these was perfectly sensible because it was the Hornet formating on the C-130 Hercules fitted with refueling pods. The Hornet took up station behind the drogue units to demonstrate how refueling would be done.
Later in the show, there was a slightly odder version of things. A USAF KC-135R Stratotanker (which was carrying Kadena tailcodes which might be a first for me) was airborne and the Hornet formated on this too. Some KC-135s do carry hose drogue units on the wings or a drogue adaptor on the end of the boom but this was not one of them. Instead, they simulated the boom refueling. The Hornet can’t refuel from the boom but, since it was just an airshow, I doubt too many people were bothered by this.