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The first operational jet bomber capable of Mach 2, the Convair B-58 Hustler, was developed for the USAFs Strategic Air Command (SAC) during the 1960s. It was primarily used as a nuclear bomber, the pod on it’s ventral section could carry a bomb/fuel combination, under the wings it carried 4 pylons for nuclear bombs and it’s 4 General Eletric J79 engines in pods, it could carry a total of 5 nuclear bombs. Due to the evolution of the Soviets SAMs, the Hustler never manage to fulfill it’s intended role and had a short operational time between 1960 and 1970.

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The evolution of the tail turret of the Boeing B-52 Stratrofortress bomber, from .50 cal to 20mm

After the gulf war if was finally removed and replaced with a stronger ECM suit, as the USAF deemed it obsolete.

Personally, the 20mm version could have been turned into a CIWS against missiles, basically just needing a new radar and fire control system, but alas, weight savings means a lot in aircraft.