GBU-39 Small Diameter Bomb (SDB) Explained

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The GBU-39 Small Diameter Bomb (SDB) is a 250 lb (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 lb (907 kg) bomb.

The small size of the bomb allows a single strike aircraft to carry more of the munitions than is possible using currently available bomb units.