Rockwell B-1 Lancer: Variable-sweep wing jet

The Rockwell B-1 Lancer is a four-engine supersonic variable-sweep wing, jet-powered heavy strategic bomber used by the United States Air Force (USAF)

The aircraft was developed into the B-1B, primarily a low-level penetrator with long range and Mach 1.25 speed capability at high altitude.

In the early 1990s, following the Gulf War and concurrent with the disestablishment of SAC and its reassignment to the newly formed Air Combat Command (ACC), the B-1B was converted to conventional bombing use

The Lancer is the supersonic component of the USAF's long-range bomber force, along with the subsonic B-52 and B-2.

The bomber is commonly called the "Bone" (originally from "B-One"). With the retirement of the General Dynamics/Grumman EF-111A Raven in 1998 and the Grumman F-14 Tomcat in 2006, the B-1B is the U.S. military's only active variable-sweep wing aircraft.

The B-1B is expected to continue to serve into the 2030s, with the Long Range Strike Bomber to start supplementing the B-1B in 2030.

Ten B-1s have been lost due to accidents. Between 1984 and 2001, 17 crew members and people on board have been killed in B-1 accidents

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