ウェブGBU-39 Small Diameter Bomb. The GBU-39/B Small Diameter Bomb ( SDB) is a 250-pound (110 kg) precision-guided glide bomb that is intended to provide aircraft with the ability to carry a higher number of more accurate bombs. Most US Air Force aircraft will be able to carry (using the BRU-61/A rack) a pack of four SDBs in place of a single 2,000 ...
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