A KC-135R 'Stratotanker' performs at the ND Centennial Air Show at the old Hector Airport terminal, Saturday 8/19/1989. Four NDANG F-4E 'Phantoms' flying in formation behind the Grand Forks AFB tanker.

The KC-135R has four turbofan engines, mounted under 35-degree swept wings, which power it to takeoffs at gross weights up to 322,500 pounds. Nearly all internal fuel can be pumped through the tanker's flying boom, the KC-135's primary fuel transfer method. A special shuttlecock-shaped drogue, attached to and trailing behind the flying boom, may be used to refuel aircraft fitted with probes. A boom operator stationed in the rear of the aircraft controls the boom while lying prone. -wiki