Massive Ordnance Air Blast bomb (MOAB)
Primary function: 21,500-pound conventional bomb
Guidance: Specific method is unknown but it is precision guided
Launch: Dropped from the rear of a C-130 cargo plane
Other features: The bomb, also known as "the mother of all bombs," is the successor to the 15,000-pound "Daisy Cutter" bomb used in Vietnam and Afghanistan. It will be the largest conventional bomb in history. Work began on the weapon in 2002 and it was first tested in March 2003 at Eglin Air Force Base in Florida.