The B-1 Lancer is a four-engine variable-sweep wing strategic bomber
used by the United States Air Force. It was first envisioned in the 1960s
as a supersonic bomber with Mach 2 speed, and sufficient range and
payload to replace the Boeing B-52 Stratofortress. It was developed into
the B-1B, primarily a low-level penetrator with long range and Mach
1.25 speed capability at high altitude. This one is seen refueling at
night from a KC-135 boom operator’s point of view.