BLU-109 bomb

BLU-109
A BLU-109 aboard an F-15E Strike Eagle configured as a JDAM
Type	Free-fall penetration bomb (guided when equipped as JDAM or Paveway)
Place of origin	United States
Specifications
Weight	1,927 lb (874 kg)
Length	7 ft 11 in (2.4 m)
Diameter	14.6 in (370 mm)

The BLU-109/B is a hardened penetration bomb used by the United States Air Force (BLU is an acronym for Bomb Live Unit). As with other "bunker busters", it is intended to smash through concrete shelters and other hardened structures before exploding. In addition to the US, it is part of the armament of the air force of Australia, Belgium, Canada, Denmark, France, Germany, Greece, Italy, Israel, the Netherlands, Norway, Saudi Arabia, United Kingdom and United Arab Emirates.

The BLU-109/B has a steel casing about 1 inch (25.4 mm) thick, filled with 530 lb (240 kg) of Tritonal. It has a delayed-action tail-fuze. The BLU-109 entered service in 1985. It is also used as the warhead of some marks of the GBU-15 electro-optically guided bomb, the GBU-27 Paveway III laser-guided bomb, and the AGM-130 rocket-boosted weapon. This weapon can penetrate 4–6 feet of reinforced concrete, which is greater than the 3 foot capability of the Small Diameter Bomb. The BLU-109 is not likely to be retired anytime soon, due to the much larger blast capable from its warhead.