This was the first bomber that could fly at Mach 2. It was designed as a nuclear attack bomber. Once the U.S.S.R. proved it could shoot down high flying fast aircraft, the B-58 was obsolete.
It was designed for the high-altitude, high-speed penetration mission, and as it was discovered how good the Soviet ADA netwrok was, SAC attempted to use it for low-level delivery, a job that its delta wings were never designed for, that's what led to their retirement.
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