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GBU-53/B Small Diameter Bomb Increment II (SDB II)
The GBU-53/B Small Diameter Bomb Increment II (SDB II) is a US-developed, 250 lb (113 kg)-class, air-dropped, stand-off, precision glide bomb. The GBU-53/B is a further development of the earlier GBU-39 Small Diameter Bomb (SDB) family, but there are many changes between the two. The GBU-53/B has a base GAINS (GPS/inertial) guidance system, its accuracy further improved by its tri-mode seeker that incorporates semi-active laser (SAL), imagi...
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