The B-1, officially known as the B-1 Lancer, is a supersonic strategic bomber used by the United States Air Force. Designed for long-range missions, it can carry both conventional and nuclear weapons. The aircraft features variable-sweep wings, allowing it to adapt its shape for different flight speeds and missions. First introduced in the 1980s, the B-1 has undergone several upgrades to enhance its capabilities. It is known for its speed, range, and ability to evade radar detection, making it a key component of the U.S. military's strategic bombing forces. The B-1 is often compared to other bombers like the B-2 Spirit and B-52 Stratofortress.