B- 1B Lancer aka BONE

The Rockwell (now part of Boeing) B-1 Lancer is a four-engine supersonic variable-sweep wing, jet-powered heavy strategic bomber used by the United States Air Force (USAF). 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. It is commonly called the "Bone" (originally from "B-One").
on display at Ellsworth AFB, South Dakota

Ellsworth was running an exercise at the time, and the base was launching B-1 sorties in response to a simulated attack.

Pictures taken and shared by Matt Riesmeyer