The BLU-82 is a 15,000 pound general purpose bomb used by the U.S. military. It is delivered to the target by a C-130 cargo plane at high altitude, or at a minimum of 6,000 feet above ground level due to the bomb's high power. 12,600 pounds of GSX slurry are contained in the warhead, creating an overpressure in excess 1,000 pounds per square inch upon detonation. The BLU-82, because it is so large, has about the same explosive power as a small nuclear device.

The BLU-82 was originally used in Vietnam during the Vietnam War to clear helicopter landing zones in the thick forests and jungles. During the Gulf War, eleven were dropped.

Source: www.fas.org