BLU-82

The BLU-82B/C-130 weapon system, known under program "Commando Vault" and nicknamed "daisy cutter" in Vietnam and in Afghanistan for its ability to flatten a section of forest into a helicopter landing zone, is a 15,000-pound (6,800 kg) conventional bomb, delivered from either a C-130 or an MC-130 transport aircraft. Two hundred and twenty-five were constructed. The BLU-82 was retired in 2008 and replaced with the more powerful MOAB.

The designation "BLU" stands for Bomb Live Unit, as opposed to "BDU" (Bomb Dummy Units) used for practice. Originally designed to create an instant clearing in the jungles of Vietnam, the BLU-82B/C-130 was test-dropped there from a CH-54 Tarhe "Flying crane" helicopter. Later it was used in Afghanistan as an anti-personnel weapon and as an intimidation weapon because of its very large blast radius (variously reported as 5000 to 5500 feet/1500 to 1700 meters) combined with a visible flash and audible sound at long distances. It is one of the largest conventional weapons ever to be used, outweighed only by a few earthquake bombs, thermobaric bombs, and demolition (bunker buster) bombs. Some of these include the Grand Slam and T12 earthquake bombs of late World War II, and more currently, the Russian Air Force FOAB and USAF GBU-43/B Massive Ordnance Air Blast bomb, and the Massive Ordnance Penetrator.

...
Wikipedia