US uses largest conventional bomb in Afghanistan

The US dropped its most powerful non-nuclear weapon, the GBU-43/B Massive Ordnance Air Blast Bomb, on an area of eastern Afghanistan said to be controlled by ISIS militants. The April 13 air-strike targeted a cave complex believed to be used by fighters affiliated with the Islamic State's self-decalred "Khorasan Province" in Achin district of Nangarhar, near the border with Pakistan. A US special forces solider was killed in the same area last week. The MOAB, nicknamed the "mother of all bombs," is a 21,600-pound, GPS-guided munition that is the largest among the Pentagon's series of so-called "bunker-busters." The strike marked the first time it has been used in combat. (The Independent, CNN, LWJ)

Is the MOAB a 'bunker-buster'?

A "What is the MOAB?" profile on Fox News states:

The concept behind the MOAB was first developed in the Vietnam War through the BLU-82B/C-130 weapon system, nicknamed the "Daisy Cutter." That weighed