The Mark 84 or BLU-117 is an American general-purpose bomb, it is also the largest of the Mark 80 series of weapons. Entering service during the Vietnam War, it became a commonly used US heavy unguided bomb (due to the amount of High-explosive content packed inside) to be dropped, second only to the BLU-82 "Daisy Cutter" then in service and presently third only to the GBU-43/B Massive Ordnance Air Blast bomb (MOAB) currently in service. Pilots flying the F-117 Nighthawk over Iraq during the first gulf war nicknamed it the "Hammer" (albeit fitted with the GBU-27 Paveway III kit for use specially by the Nighthawks), for its considerable destructive power and blast radius.