In 2003, the US military developed the GBU-43B bomb. The bomb is also known as the Massive Ordinance Air Blast (MOAB), however, some refer to MOAB as Mother of All Bombs. It is a 21,000 pound conventional bomb. Compare that to the Tomahawk cruise missiles the US just used in the strike in Syria that are only 1,000 pounds.
The bomb has never been used in combat until Thursday when it was dropped on an ISIS location in the Nagharhar Provincve of eastern Afghanistan.
MOAB explodes in the air above the ground and sends out an air pressure shock wave that collapses buildings and tunnels.
US General John Nicholson, commander of US forces in Afghanistan issued a statement that read in part:
“As [ISIS’] losses have mounted, they are using IEDs, bunkers and tunnels to thicken their defense. This is the right munition to reduce these obstacles and maintain the momentum of our offensive against [ISIS].”